user_turns: <SILENCE> expensive restaurant european north 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 expensive price range . What type of food do you want? There are restaurants serving european in the expensive price range . What area would you like? I'm sorry but there is no european restaurant in the north of town  you are welcome