generate response: Yes, if you can book it for three people, please. I will need the reference number. Intent: book_train. Slots: train-bookpeople=3, train-day=thursday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=14:45
Response: I have booked 3 tickets, your reference number is EH1JDWFV . The cost is 30.29 payable at the station, can I do anything else?