Connection between Two Cruds

I want to send data from a Controller to an other one. From Client Crud to Reservation Crud. With this form i want send to booking method in ReservationController to associate a room with the client.

  <form action="{{Route('reservation.booking', $room->id, $client->id)}}" method="POST">
     @csrf
     @method('get')
     <select class="roomname" name="roomname">
        <option selected>Elige habitacion</option>
        <option value="{{$rooms[0]->id}}">ESTANÇA DEL PUIGRACIÓS</option>
        <option value="{{$rooms[1]->id}}">ESTANÇA DE SANT CRISTÒFOL</option>
        <option value="{{$rooms[2]->id}}">ESTANÇA (DÚPLEX) DEL ROCACENTELLA</option>
     </select>                        
    <input type="submit" value="Reservar habitación" class = "btn btn-primary">
  </form> 

    public function booking(Room $room, Client $client)
      {
       //dd($client);

       $room->client()->associate($client);
       $room->save();

       return redirect(route('reservation.create'));
      }
The route definition:

Route::get('/reservation/{reservation}/booking','ReservationController@booking')
->name('reservation.booking');

And I got this message:

SQLSTATE[HY000]: General error: 1364 Field 'name' doesn't have a default value (SQL: insert into rooms (client_id, updated_at, created_at) values (?, 2020-05-10 16:21:19, 2020-05-10 16:21:19))