generate response: Yes 18:15 would work I have to get there by 21:00 is that an option?. Intent: find_train. Slots: train-arriveby=21:00, train-day=wednesday, train-departure=cambridge, train-leaveat=18:15, after 18:00
Response: Yes. I would recommend TR7776 which leaves Cambridge at 18:36 and arrives in Norwich at 19:55.