generate response: I'll take the first train at 13:40 for 7 people please and I will need the reference number as well.. Intent: book_train. Slots: train-bookpeople=7, train-day=sunday, train-departure=birmingham new street, train-destination=cambridge, train-leaveat=13:15
Response: Certainly, I have booked the train, your reference number is PG27S8V6 . May I help you with anything else?