What does Mr. Smith tell his secretary to say?

W: You have a telephone call, Mr. Smith.
M: Who is it?
W: He didn’t say.
M:Tell him I’m not in the office. Say I’ll be back by four o’clock.
W: A11 right. Hello, sir... ?
M:Yes?
W: I’m afraid he’s just stepped out of the office. May I ask who’s calling?
M:Yes, this is Edgar Davis from Boston.
W: Oh, yes, Mr. Davis. I am sure he won’t be back until four o’clock. Could you give me your number, please.
M:Yes.