generate response: I need to travel on saturday from cambridge to london kings cross and need to leave after 18:30. Intent: find_train. Slots: train-day=saturday, train-departure=cambridge, train-destination=london kings cross, train-leaveat=18:30
Response: Train TR0427 leaves at 19:00 on Saturday and will get you there by 19:51. The cost is 18.88 pounds. Want me to book it?