user_turns: <SILENCE> no no vietnamese im looking for a 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 ? You are looking for a indian restaurant right? There are restaurants serving indian in the expensive price range . What area would you like? Sorry, I can't hear you I'm sorry but there is no restaurant serving expensive vietnamese food Could you please repeat that?  you are welcome