user_turns: <SILENCE> <SILENCE> im looking for a restaurant in the center that serves bistro food bistro food how about north_american food north_american food <SILENCE> okay what is the phone number thank you good bye
system_turns: Hello , welcome to the Cambridge restaurant system . You can ask for restaurants by area , price range or food type . How may I help you ? What kind of food would you like? There are restaurants in the centre of town . What type of food do you want? I'm sorry but there is no restaurant serving bistro food Could you please repeat that? api_call north_american R_location R_price gourmet_burger_kitchen serves north_american food The phone number of gourmet_burger_kitchen is gourmet_burger_kitchen_phone  you are welcome