public async Task <CreateTripHandlerResponse> HandleAsync(CreateTripHandlerRequest request) { var customer = await _customerRepository.RetrieveByIdAsync(request.CustomerId); if (customer == null) { return(new CreateTripHandlerResponse { OperationResponse = OperationResponse.Error("Customer not found") }); } var trip = await _tripFactory.CreateAsync(request.Title, request.Departure, request.Arrival, customer); await _tripRepository.CreateAsync(trip); await _unitOfWork.SaveAsync(); return(new CreateTripHandlerResponse { Trip = trip }); }