generate response: I need to leave cambridge on Tuesday. The train should arrive by 12:00.. Intent: find_train. Slots: train-arriveby=12:00, train-day=tuesday, train-departure=cambridge, train-destination=london liverpool street
Response: Ok, train TR4494 leaves cambridge to london liverpool street on tuesday at 09:59 and arrives at 11:27. Shall i book it, if so for how many people?