generate response: I would like to leave after 19:00, other than that, I have no other preference. Please provide me with the train ID of one of these trains.. Intent: find_train. Slots: train-arriveby=dontcare, train-day=monday, train-departure=cambridge, train-destination=london kings cross, train-leaveat=19:00
Response: TR2634 leaves at 21:00 and arrives by 21:51. Would you like me to book that for you?