user_turns: <SILENCE> cheap european <SILENCE> can i change the price range any price range any price range
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? api_call european R_location cheap Sorry there is no european restaurant in the cheap price range There are restaurants serving european in the cheap price range . What area would you like? Sorry there is no european restaurant in the cheap price range  you are welcome