generate response: I would like the reference number for the train and am also seeking a cheap restaurant that serves North African food.. Intent: find_train. Slots: restaurant-food=north african, restaurant-pricerange=cheap, train-day=wednesday, train-departure=cambridge, train-destination=birmingham new street, train-leaveat=16:30
Response: How many tickets do you need for the train? And unfortunately, I'm not finding any cheap North African restaurants. Would you like to look for something different?