generate response: I will need 2 tickets. Intent: book_train. Slots: train-arriveby=17:30, train-bookpeople=2, train-day=friday, train-departure=london kings cross, train-destination=cambridge
Response: OK, I've booked you for 2 tickets with reference number ERCAZMGA . The fee will be 47.20 GBP, payable at the station. Can I help you with anything else?