generate response: No I don't have a preference. I want to book for four people at 15:00 on Saturday.. Intent: book_restaurant. Slots: restaurant-area=west, restaurant-bookday=saturday, restaurant-bookpeople=4, restaurant-booktime=15:00, restaurant-food=dontcare, restaurant-pricerange=expensive
Response: Okay I booked a table for 4 at 15:00 on Saturday at the Graffiti, an expensive British restaurant in the west area of town.