generate response: I'll be leaving cambridge and arriving at bishops stortford on wednesday, I'd like to leave after 12:45.. Intent: book_train. Slots: train-bookpeople=4, train-day=wednesday, train-departure=cambridge, train-destination=bishops stortford, train-leaveat=12:45
Response: How about TR3844? It leaves at 13:29 and arrives by 14:07.