What time will the man call again? Why is Peter phoning?

M: Hello, can you put me through to Jack, your Marketing Manager?
F: OK, hold on, please ... I am sorry. Jack’s on the phone right now.
M: Then, I will call him later this afternoon.
F: Can you tell me what time you will call him?
M: At about half past four.
F: Now it is half past three. That is one hour later.

F: Good morning, Brightcom.
M: Hello, this is Peter Blackwell. I’m calling about an appointment with John White.
F: Oh yes. John’s sorry he couldn’t make a definite arrangement yesterday. He had to check his diary about the fourth.
M: Is it OK?
F: Well, that or the ninth.
M: The fourth suits me better.
F: Fine, I’ll tell him.