generate response: Yes, please book me a ticket on the 18:40 train. I will need to know how much the ticket costs and the train ID. Thanks!. Intent: book_train. Slots: train-bookpeople=1, train-day=friday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=18:30
Response: OK, your ticket is booked. Your ticket cost is 10.10 pounds, and your train ID is TR8337.