generate response: I don't have a departure time in stone, but I need to arrive by 17:15.. Intent: find_train. Slots: train-arriveby=17:15, train-day=saturday, train-departure=cambridge, train-destination=stansted airport
Response: The TR2001 is the last train of the day and arrives at 17:08. The train before it is TR0638 and arrives at 16:08. Do you want me to book one for you?