Goal: Task 04722: You want to find a cheap restaurant and it should serve mexican food. If there is no such venue how about vietnamese type of food. You want to know the phone number.

user: I would like a cheap Mexican restaurant, please.

system: What part of town would you like to dine in?

user: I don't care

system: I'm sorry, but our only Mexican restaurant is expensive.  Would you like more information or could I search for another type of restaurant for you?

user: Is there any Cheap vietnamese locations?

system: Thanh binh is a cheap vietnamese restaurant. 

user: May I get the phone number of Thank binh, please?

system: The phone number for thanh binh is 01223 362456.  May I help you with anything else today? 

user: No, I believe that it's. Thanks for your help.

system: You're welcome.