user_turns: <SILENCE> id like a restaurant in any area that serves persian food how about vietnamese food vietnamese <SILENCE> what is the address and phone number what is the address 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 ? There are restaurants in all parts of town . What type of food do you want? I'm sorry but there is no restaurant serving persian 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 Sure , thanh_binh is on thanh_binh_address  you are welcome