generate response: Yes please do book the 15:39. Intent: book_train. Slots: train-bookpeople=1, train-day=tuesday, train-departure=london liverpool street, train-destination=cambridge, train-leaveat=15:39
Response: Great, that's train TR5245, leaving london liverpool street going to cambridge at 15:39. I booked 1 ticket for you which is payable at the station.