generate response: Can you make a booking for me?. Intent: book_train. Slots: train-day=friday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=13:30
Response: Your train leaving at 13:40 from Cambridge going to Stansted airport has been booked. Your reference number is 39OY8NLR . The total fee is 10.1 GBP payable at the station.