user_turns: <SILENCE> persian food indian food east cheap 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 ? I'm sorry but there is no restaurant serving persian food What part of town do you have in mind? Would you like something in the cheap , moderate , or expensive price range? I'm sorry but there is no indian restaurant in the east of town and the cheap price range  you are welcome