public void Handler(UpdateReservationCommand command)
        {
            var reservation = _getReservationByIdQuery.Handler(new GetReservationByIdQuery()
            {
                Id = command.Id
            });

            if (command.ExpirationDate == null)
            {
                reservation.ExpirationDate = reservation.Date;
            }
            else
            {
                reservation.ExpirationDate = command.ExpirationDate;
            }

            _db.Update(reservation).SaveChanges();
        }