user_turns: <SILENCE> restaurants <SILENCE> yes how about vietnamese ok i want vietnamese yes vietnamese vietnamese food <SILENCE> price range price range what is price range phone number yes <SILENCE> phone number please 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? Ok , a restaurant in any part of town is that right? What kind of food would you like? I'm sorry but there is no restaurant serving singaporean food Ok , a restaurant in any part of town is that right? You are looking for a singaporean restaurant right? I'm sorry but there is no restaurant serving singaporean food api_call vietnamese R_location R_price thanh_binh serves vietnamese food I am sorry but there is no other vietnamese restaurant that matches your request thanh_binh serves vietnamese food thanh_binh is in the cheap price range Ok , a restaurant in any part of town is that right? thanh_binh serves vietnamese food thanh_binh is a great restaurant The phone number of thanh_binh is thanh_binh_phone  you are welcome