generate response: I would like to leave after 18:15. Also, I would like to know the fare.. Intent: find_train. Slots: train-day=saturday, train-departure=peterborough, train-destination=cambridge, train-leaveat=18:15
Response: TR4005 departs Peterborough at 18:19 and arrives in Cambridge at 19:09. Total travel time is 50 minutes, and the fare is 13.20 GBP per person.