user_turns: <SILENCE> i want an expensive restaurant that serves portuguese food <SILENCE> how about british food <SILENCE> 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 ? api_call portuguese R_location expensive Sorry there is no portuguese restaurant in the expensive price range api_call british R_location expensive graffiti is a great restaurant serving british food and it is in the expensive price range The phone number of graffiti is graffiti_phone  you are welcome