user_turns: <SILENCE> how about is there a restaurant serving vietnamese food im looking for a restaurant that serves vietnamese food <SILENCE> can i get the address and 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 ? I'm sorry but there is no restaurant serving swiss food Could you please repeat that? api_call vietnamese R_location R_price thanh_binh serves vietnamese food The phone number of thanh_binh is thanh_binh_phone  you are welcome