user_turns: <SILENCE> <SILENCE> <SILENCE> <SILENCE> <SILENCE> 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 ? I am sorry but there is no world restaurant that matches your request There are restaurants serving world food . What area do you want? api_call R_cuisine R_location R_price Sorry there is no world restaurant in the cheap price range  you are welcome