generate response: I want to go from cambridge to ely, no preference for time but I need to book for 8 people.. Intent: book_train. Slots: train-arriveby=dontcare, train-bookpeople=8, train-departure=cambridge, train-destination=ely, train-leaveat=dontcare
Response: There are trains that run every two hours every day starting at 5:50. Do you know what day you'd like to travel?