Query scopes for reservation system with multiple rooms.

I am working on a hotel reservation system, where user|admin can select multiple rooms. I am facing a problem in the edit functionality. I am looking for help and suggestions on how to make this right.

My schema.

Rooms:

1. room_number
2. price
3. reserved(Boolean)

Reservations:

1. customer_id
2. checkin
3. checkout

Reservation_Room

1. room_id
2. reservation_id
3. TotalPrice

Query scope on rooms

public function scopeIsNotReserved($query) { return $query->where('reserved', false); }

The actual problem is.

1. I cannot use IsNotReserved query scope while editing a reservation, because it won't pass the value to the selected options.
2. I would like to pass all the rooms that are not reserved except this reservation.id(See $roomId)

My controller edit function looks like this.

$reservation = Reservation::findOrFail($id);

$customers = Customer::pluck('name', 'id')->toArray();

// Currently not doing anything with this query.

$roomId = $reservation->rooms()->pluck('rooms.id')->toArray();

$rooms = Room::IsNotOnMaintainance()->get();