generate response: Please book two seats on that train, and send me the reference number.. Intent: book_train. Slots: train-bookpeople=2, train-day=wednesday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=11:00
Response: Booked! Your reference number is 89Q51FJW . The fee is 20.2 GBP and paid at the station.