generate response: I am departing from cambridge and arriving in london kings cross.. Intent: find_train. Slots: train-day=thursday, train-departure=cambridge, train-destination=london kings cross, train-leaveat=15:45
Response: Ok, leaving after 15:45 on thursday we have Train TR1791 from cambridge to london kings cross leaving at 17:00 and arriving at 17:51. Shall I book it, if so for how many?