generate response: How about an hour earlier?. Intent: book_restaurant. Slots: restaurant-area=north, restaurant-bookday=sunday, restaurant-bookpeople=3, restaurant-booktime=an hour earlier, restaurant-food=chinese, restaurant-name=hakka, restaurant-pricerange=expensive
Response: Yes, the table was available for 15:30. The booking was successful. The table will be reserved for 15 minutes. Reference number is : RRKZOI5C .