generate response: Yes. Please book that train for seven people, and include a reference number.. Intent: book_train. Slots: train-bookpeople=7, train-day=tuesday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=12:30
Response: Booking was successful, the total fee is 70.7 GBP payable at the station. Reference number is : D02FBWKX .