Griham Turner : Is that you, John?
John Smith : Yes, speaking.
Griham Turner : Tell Mary we shall be late for dinner this evening.
John Smith : I'm afraid I don't understand.
Griham Turner : Hasn't Mary told you? She invited Betty and me to dinner this evening. I said I would be at your house at six o'clock, but the boss wants me to do some extra work. I'll have to stay at the office. I don't know when I shall finish. Oh, and by the way, my wife wants to know if Mary needs any help.
John Smith : I don't know what you're talking about.
Griham Turner : That is John Smith, isn't it?
John Smith : Yes, I'm John Smith.
Griham Turner : You are John Smith, the engineer, aren't you?
John Smith : That's right.
Griham Turner : You work for the Overseas Engineering Company, don't you?
John Smith : No, I don't. I'm John Smith the telephone engineer and I'm repairing your telephone line.