generate response: Does not matter when I arrive, whatever is closest to leaving at 12:30 but after, can you please book me for 7 and give me a reference number?. Intent: book_train. Slots: train-arriveby=dontcare, train-bookpeople=7, train-day=friday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=12:30
Response: I have you booked on TR0188, leaving Cambridge at 12:40. The total fee is 70.7 GBP payable at the station. Reference number is BFK34XQC .