Flow_trip-requested_book-trip Flow_trip-requested_book-trip Flow_book-trip_send-itinerary Flow_booking-start_book-flight Flow_booking-start_book-flight Flow_book-flight_book-hotel Flow_book-flight_book-hotel Flow_book-hotel_hotel-ok Flow_book-hotel_hotel-ok Flow_hotel-ok_hotel-unavailable Flow_hotel-ok_book-car Flow_hotel-ok_hotel-unavailable Flow_hotel-ok_book-car Flow_book-car_car-ok Flow_book-car_car-ok Flow_car-ok_car-unavailable Flow_car-ok_trip-booked Flow_car-ok_car-unavailable Flow_car-ok_trip-booked =hotelConfirmation = null =carConfirmation = null Flow_on-booking-failed_cancel-flight Idempotent: cancelling a booking that does not exist is a no-op. Flow_on-booking-failed_cancel-flight Flow_cancel-flight_release-hotel Idempotent: releasing a hold that does not exist is a no-op. Flow_cancel-flight_release-hotel Flow_release-hotel_notify-trip-failed Flow_release-hotel_notify-trip-failed Flow_notify-trip-failed_trip-not-booked Flow_notify-trip-failed_trip-not-booked Flow_book-trip_send-itinerary Flow_send-itinerary_trip-confirmed Flow_send-itinerary_trip-confirmed