generate response: I'd like to depart after 15:00 on thursday no preference on arrival.. Intent: find_train. Slots: train-arriveby=dontcare, train-day=thursday, train-departure=peterborough, train-destination=cambridge, train-leaveat=15:00
Response: TR8509 will leave Peterborough at 15:19 and arrive in Cambridge at 16:09. Would you like to book tickets on this train?