I'm looking for a cheap restaurant in the west area. 
You have your choice of La Margherita, which serves Italian food, or Thanh Binh, which offers vietnamese cuisine.
Let's go with La Margherita. Could you book a table for 2 people at 13:30 on Saturday?
I was unable to book that, would you like me to try something else?
Yes as long as its in the same area and price range. I need a reference number too then please
I was able to get you into Thanh Binh. Your reference number is CLIBOL1Q.
Okay that is all I need for now.
Thank you and goodbye.