user_turns: <SILENCE> restaurant west afghan food vietnamese food vietnamese food <SILENCE> phone number 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? I'm sorry but there is no restaurant serving afghan food Could you please repeat that? api_call vietnamese west R_price thanh_binh is a nice place in the west of town serving tasty vietnamese food Can I help you with anything else? The phone number of thanh_binh is thanh_binh_phone  you are welcome