generate response: I'm leaving Bishops Stortford and going to Cambridge I need to leave after 16:30 on Sunday.. Intent: find_train. Slots: train-day=sunday, train-departure=bishops stortford, train-destination=cambridge, train-leaveat=16:30
Response: Ok, ther first train after 16:30 is TR5298 from bishops stortford to cambridge on sunday at 17:29 and arrives at 18:07. Shall I book it, if so for how many?