public function checkAvailability($arrival, $departure, $roomTypeId, $amount)
    {
        $period = $this->createPeriod($arrival, $departure);

        $availableRooms = Room::where('room_type_id', $roomTypeId)->where('is_available', 1)->lists('id');
        $occupancyArray = Night::where('date', '>=', $arrival)->where('date', '<=', $departure)->get()->toArray();
        foreach ($occupancyArray as $night) {
            foreach ($period as $key => $date) {
                $dateFormatted = $date->format('Y-m-d H:i:s');
                if (in_array($dateFormatted, $night)) {
                    unset($availableRooms[array_search($night['room_id'], $availableRooms)]);
                }
            }
        }

        return $availableRooms;
    }