generate response: Anytime after 13:15.. Intent: find_train. Slots: train-day=saturday, train-departure=london liverpool street, train-destination=cambridge, train-leaveat=13:15
Response: How about TR4078 leaving london liverpool street on saturday at 13:39 and arriving at cambridge at 15:07, making it an 88 minute ride? It costs 13.28 pounds.