generate response: Yes, please choose the earliest one after 09:30 and book it for 7 people. And don't forget to send the reference number!. Intent: book_train. Slots: train-bookpeople=7, train-day=tuesday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=09:30
Response: Booking was successful for a train departing at 09:40. The reference number is NJ1GZ4Y0 . Will there be anything else today?