user_turns: <SILENCE> i want to find a restaurant in any area persian food how about vietnamese <SILENCE> how about vietnamese <SILENCE> vietnamese food may i have the address and phone nymber and the phone number 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 ? What kind of food would you like? I am sorry but there is no persian restaurant that matches your request api_call persian R_location R_price gourmet_burger_kitchen is a nice restaurant in the centre of town serving north_american food api_call vietnamese R_location R_price the_hotpot is a nice restaurant in the north of town serving chinese food thanh_binh is a nice restaurant in the west of town serving vietnamese food Sure , thanh_binh is on thanh_binh_address The phone number of thanh_binh is thanh_binh_phone  you are welcome