Read the following conversation and answer the question.

W: Good morning. Dr. Zane's office.

M: This is Mr. Hill. I have a ten o'clock appointment, but I'm running a little late. Do you have any openings this afternoon?

W: Sorry we don't. Can you come tomorrow morning?

M: OK. See you then.

Question: Why is the man calling? 

- To change his appointment.

- To speak to Dr. Zane.

- To see the woman.


To change his appointment.