generate response: Yes can you give me the travel time?. Intent: book_train. Slots: train-bookpeople=1, train-day=monday, train-departure=stansted airport, train-destination=cambridge, train-leaveat=17:00
Response: Sure, I was able to book your seat and your reference number is 4EIV9UFN which is payable at the station. The travel time is 28 minutes.