generate response: Yes. The 17:21 would be perfect. Please book it for 4 people.. Intent: book_train. Slots: train-arriveby=18:30, 1830, train-bookpeople=4, train-day=monday, train-departure=cambridge, train-destination=stevenage
Response: Your booking was successful, the total fee is 51.2GBP, payable at the station. Reference number is YSJ6ZWYT . Anything else I can help you with today?