generate response: I'd like to depart Cambridge after 21:30.. Intent: find_train. Slots: train-day=friday, train-departure=cambridge, train-destination=ely, train-leaveat=21:30
Response: The train TR9842 is leaving Cambridge on Friday at 21:50. The cost is only 4.40 pounds and the travel time is 17 minutes. Would you like me to book?