user_turns: <SILENCE> unusual food expensive centre unusual <SILENCE> north <SILENCE> south <SILENCE> mediterranean <SILENCE> moderate <SILENCE> city centre <SILENCE> 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 ? Would you like something in the cheap , moderate , or expensive price range? What part of town do you have in mind? What kind of food would you like? api_call unusual centre expensive Sorry there is no expensive restaurant in the centre of town serving unusual food api_call unusual north expensive Sorry there is no expensive restaurant in the north of town serving unusual food api_call unusual south expensive Sorry there is no expensive restaurant in the south of town serving unusual food api_call unusual west expensive Sorry there is no expensive restaurant in the south of town serving mediterranean food api_call unusual west moderate Sorry there is no moderate restaurant in the south of town serving mediterranean food api_call unusual centre moderate Sorry there is no moderate restaurant in the centre of town serving mediterranean food  you are welcome