generate response: I'd like to go to Stansted Airport on Saturday. There will be 5 of us. Can you book that?. Intent: book_train. Slots: train-bookpeople=5, train-day=saturday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=15:30
Response: 5 tickets for train TR0638 departing from Cambridge at 15:40 and arriving at Stansted Airport at 15:08 this Saturday. The fee is payable at the station. Reference number: MVIBVUVE .