user_turns: <SILENCE> <SILENCE> cantonese food british food west <SILENCE> 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? I am sorry but there is no cantonese restaurant that matches your request What part of town do you have in mind? api_call british west R_price graffiti is a nice restaurant in the west of town serving british food  you are welcome