What is the conversation mainly about?

W: Hi, Michael. l’ve been trying to complete our expense summary for last month, but I can’t do it without the receipts from your trip to St. Paul.
M: I had completely forgotten about that. Unfortunately, the receipts are in my luggage at home. When’s the summary due?
W: Mr. Brown is expecting it tomorrow morning. Do you think you could fax me a copy of each receipt by tonight?
M: I don’t have a fax machine at home, but I do have a scanner. l can make copies with that and send them to you by e-mail.