What is the man asking the woman about?

M: Why didn’t you take care of the electricity bill? I gave you my share of the bill and told you to pay it last Wednesday. We just got a second notice in the mail today.(53)
W: You are kidding me. I was busy on the day you asked me because I had to run an important errand for my boss, so I just couldn’t get to the bank on time. And then I completely forgot all about it on Thursday because of the seminar I had to attend. I only remembered it after lunch on Friday and went straight to the bank and paid it.(55)
M: I guess they must have sent out the notice before you paid then. I’ll call them and straighten this out.(54)
W: I am sorry, but I couldn’t help it. I’ll remember to take care of the bills early from now on.