Where is Mr. Li?

W: May I speak to Mr Li?
    M: Which Li, ma’ am? There are two Lis here.
    W: Oh? Mr Li, head of the Export Section.
    M: Oh, the chief? That’s Mr Michael Li, then.
    W: Is that right?
    M: I’m sorry, but Mr Li’s gone on a trip.
    W. I see. When will he return?
    M: He’ll be back next Monday.
    W: All right. I’ll call on Monday again.
    M: May I have your name?
    W: Mrs Dorothy Preston.
    M: Mrs Dorothy Preston. Is that Dorothy with a "y"?
    W: That’ s right.
    M: I’ll tell Mr Li you called when he returns.
    W: Thank you.