generate response: I would like you to book 4 tickets for me. Thanks.. Intent: book_train. Slots: train-bookpeople=4, train-day=thursday, train-departure=london liverpool street, train-destination=cambridge, train-leaveat=08:30
Response: The train is booked with reference number NGPNXG1Q . The total fee is 66.4 GBP, payable at the station. Is there anything else?