There are 133 trains making that route, what day and time would you like to go? I can get you on the 12:40, arriving at the airport at 13:08. Will that work?
I would like to find a train heading from Cambridge to Stansted Airport. I'd like to leave on Tuesday after 12:30. Yes. Please book that train for seven people, and include a reference number.
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "13:08", "destination": "the airport", "leave at": "12:40"}}
{"__type": "NotifySuccess", "service": "train", "entity": {"__type": "Train", "price": "70.7 GBP", "ref": "D02FBWKX"}}
Booking was successful, the total fee is 70.7 GBP payable at the station. Reference number is : D02FBWKX .