user_turns: <SILENCE> <SILENCE> is there any serving vietnamese what about vietnamese food <SILENCE> whats the addre thank you goodbye
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 part of town do you have in mind? I'm sorry but there is no restaurant serving world food api_call vietnamese R_location R_price thanh_binh serves vietnamese food Sure , thanh_binh is on thanh_binh_address  you are welcome