user_turns: <SILENCE> yea im looking for a restaurant in the moderate price range serving vietnamese food <SILENCE> is it moderately priced okay well any price range at all whats the address yes is it serving vietnamese food what is the address okay 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 vietnamese R_location R_price thanh_binh serves vietnamese food I'm sorry but there is no restaurant serving moderate vietnamese food Could you please repeat that? Can I help you with anything else? thanh_binh is a great restaurant Can I help you with anything else? Sure , thanh_binh is on thanh_binh_address  you are welcome