I would like a cheap Mexican restaurant, please.
What part of town would you like to dine in?
I don't care
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?
Is there any Cheap vietnamese locations?
Thanh binh is a cheap vietnamese restaurant. 
May I get the phone number of Thank binh, please?
The phone number for thanh binh is 01223 362456.  May I help you with anything else today? 
No, I believe that it's. Thanks for your help.
You're welcome.