generate response: Yes that is perfect. Can you book that and give me a reference number?. Intent: book_train. Slots: train-arriveby=20:38, train-bookpeople=1, train-day=saturday, train-departure=peterborough, train-destination=cambridge, train-leaveat=19:48
Response: Yes I booked it and your reference number is 6793D7ED . Will there be anything else?