What is the purpose of the man’s call?

M: Hi, this is Bill Patton calling about the items I purchased through your Web site yesterday.
W: Hello, Mr. Patton. Yes, you should’ve received your invoice by e-mail this morning.
M: I did, thanks. But I’m afraid I need to remove one of the items from my order. I just realized I spent more than the $ 700 limit my company gave me.
W: That’s not a problem. May I ask which item you no longer need?
M: Well, I really need the hard drive for my work, so I guess I’ll not bother getting speakers this time.
W: Okay. I’ll adjust your invoice and e-mail it to you. Your delivery fee will be reduced by 5 dollars, too. You should receive the items within 3 days.