A: Ma’am how may I help you?
B: Yes, I would like to have a cup of coffee with sugar and no milk. A: And you sir?
C: I would like a beef burger with extra cheese and no lettuce or tomatoes.
A: I am sorry sir, but we are out of beef. How about a chicken burger instead?
C: That’s too bad. Do you serve sandwiches?
A: Yes, of course sir.
C: Alright then make that two grilled chicken sandwiches. With extra cheese of course.
A: Yes, sir. Bringing it right away.
C: Thank you.