Adding data to database one field doesn't accepting value from Request class

While I'm creating a new entry to my database only one field not accepting value from Request class.

$booking = Booking::create([
                'user_id'              => $request->user_id,
                'event_id'             => $request->event_id,
                'hall_id'              => $request->hall_id,
                'package_id'           => $request->package_id,
            ]);

Here event_id not accepting the value from $request->event_id. When I dd() the $request it having the value. dd($request) output

"user_id" => "1"
"event_id" => "5"
 "hall_id" => "5"
 "package_id" => "1"

What i'm missing?