user_turns: <SILENCE> restaurant in the west part of town that serves ca cantonese vietnamese food vietnamese food <SILENCE> phone number whats the phone number <SILENCE> 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 ? There are restaurants in the west of town . What type of food do you want? I'm sorry but there is no restaurant serving cantonese 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 Could you please repeat that? The phone number of thanh_binh is thanh_binh_phone I am sorry but there is no other vietnamese restaurant in the west of town Could you please repeat that?  you are welcome