Why does the man make the phone call?

W: Hello, thank you for calling Bradford and Sons. This is Tracy speaking. How may I help you?
M: Hello. I would like to speak to your director of human resources, Ms. Jenkins, please.
W: Just a moment. I’ll check to see if she is at her desk. May I tell her who is calling?
M: This is Bill Burton from Milford Insurance.(1)I’m calling to confirm our meeting next Tuesday.
W: Thank you, Mr. Burton. Can you please hold for a moment? I’ll check to see if she is available.
M: No problem.
W: I’m sorry. Ms. Jenkins is away from her desk. She has already left for lunch. Would you like to leave a message for her?
M:(2)Yes. Please have her call me back when she returns to the office. It’s best if she can get in touch with me before 3 p. m. today: she can reach me at my office number, 635 -8799.
W: I’m sorry I didn’t quite catch that. Could you please repeat the number?
M: No problem.(3)My office number is 635 -8799. Tell her to ask for extension 31.
W: I’m sorry, Mr. Burton.(3)Just to confirm, your name is spelled B-U-R-T-O-N. Is that correct?
M:(3)Yes. And I represent Milford Insurance.
W: I will make sure Ms. Jenkins receives your message and returns your call before 3 p. m. this afternoon.
M: Thank you very much.