Laravel/livewire

Hello, i have got problem, that if in dropdwon just one record left i cant submit reservation and it writes me "available_business_hour_id": ["The available business hour id field is required."] but i have available_business_hour_id for that reservation, every available time has his own id .. so this is blade

<section id="booking">
    <div class="modal fade" id="bookingModal" tabindex="-1" aria-labelledby="bookingModalLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                </div>
                <div class="modal-body">
                    <form wire:submit.prevent="store">
                        @csrf
                        <div class="col-12 mb-4">
                            <h1 class="modal-title fs-5 text-center" id="bookingModalLabel">Objednej se</h1>

                            <p class="">Lorem, ipsum dolor sit amet consectetur adipisicing elit. Lorem, ipsum
                                dolor
                                sit amet consectetur adipisicing elit.</p>
                        </div>
                        <div class="form-group col-12">
                            <input type="text" wire:model="full_name" id="full_name" name="full_name" class="form-control rounded"
                                placeholder="Celé jméno*" required>
                        </div>
                        <div class="form-group col-12">
                            <input type="email" wire:model="email" id="email" name="email" class="form-control rounded"
                                placeholder="Email*" required>
                        </div>
                        <div class="form-group col-12">
                            <input type="text" wire:model="phone_number" id="phone_number" @error('phone_number') @enderror name="phone_number" class="form-control rounded"
                                placeholder="700 700 700*" required>
                                @error('phone_number')
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $message }}</strong>
                                    </span>
                                @enderror
                        </div>

                        <div class="form-group col-12">
                            <label for="available_business_hour_id" class="form-label">Vyberte čas rezervace:*</label>
                            <select wire:model="available_business_hour_id" name="available_business_hour_id" id="available_business_hour_id"
                                class="form-control" id="available_business_hour_id" required>
                                @foreach ($availableTimes as $time)
                                    <option value="{{ $time->id }}">{{ $time->formattedDayAndDate }}
                                        {{ $time->getFormattedDate }} od {{ $time->from }} do {{ $time->to }}
                                    </option>
                                @endforeach
                            </select>
                        </div>


                        <div class="form-group col-12 text-center">
                            <div class="cta-btns">
                                <button type="submit" class="btn btn-service me-sm-2">Odeslat</button>
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</section>

this is component

<?php

namespace App\Livewire;

use Livewire\Component;
use App\Models\Reservation;
use App\Models\AvailableTime;
use App\Models\AvailableBusinessHour;
use App\Http\Requests\ReservationRequest;

class Booking extends Component
{

    public $full_name;
    public $email;
    public $phone_number;

    public $available_business_hour_id;
    public $availableTimes;

    public function mount()
    {
        $this->availableTimes = AvailableBusinessHour::whereDoesntHave('reservation')->get();;

    }

    public function render()
    {
        return view('livewire.booking');
    }

    public function store()
    {
        $this->validate([
            'full_name' => 'required|string|max:250',
            'email' => 'required|email|max:250',
            'phone_number' => 'required|phone:CZ',
            'available_business_hour_id' => 'required'
        ]);

        $newReserve = Reservation::create([
            'full_name' => $this->full_name,
            'email' => $this->email,
            'phone_number' => $this->phone_number,
            'available_business_hour_id' => $this->available_business_hour_id,
        ]);
        dd($newReserve);
        $this->reset(['full_name', 'email', 'phone_number', 'available_business_hour_id']);

        return back();
    }



}

and this is model

<?php

namespace App\Models;

use App\Models\AvailableBusinessHour;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class Reservation extends Model
{
    use HasFactory;

    protected $table = 'reservations';
    protected $fillable = [
       'full_name',
       'email',
       'available_business_hour_id',
       'phone_number'
    ];

    public function availableBusinessHour()
    {
        return $this->belongsTo(AvailableBusinessHour::class);
    }

}

Can anyone please give me advice where can be a problem?..I am struggling with taht for few hours..this is my startup project iam new to it..