Laravel Query scopes for hotel reservation system with multiple rooms on edit method

I am working on a hotel reservation system, where user|admin can select multiple rooms for Reservation. 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:

room_number
price
reserved(Boolean)
maintenance(Boolean)

Reservations:

customer_id
checkin
checkout

Reservation_Room

room_id
reservation_id
TotalPrice

Query scope on rooms

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

Relationship Reservation Model:

public function rooms()
{
    return $this->belongsToMany(Room::class);
}

The actual problem is.

I cannot use IsNotReserved query scope while editing a reservation, because it won't pass the value to the selected options. 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();

Getting All Rooms

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

via Chebli Mohamed