user_turns: <SILENCE> <SILENCE> european food how about vietnamese food vietnamese is there a vietnamese restaurant <SILENCE> may i have the phone number please 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 ? What kind of food would you like? There are restaurants serving european food . What area do you want? I'm sorry but there is no restaurant serving cheap european food Could you please repeat that? api_call vietnamese R_location R_price thanh_binh serves vietnamese food in the cheap price range The phone number of thanh_binh is thanh_binh_phone  you are welcome