Interesting IM

I just had the following IM conversation. (Other person's IM name withheld)

[07:34] xxxxxxxxxxxx: Good Morning
[07:37] msauers: Sorry, not recognizing your IM name...
[07:37] xxxxxxxxxxxx: It's me DEBBIE
[07:38] xxxxxxxxxxxx: you know your sis in law
[07:38] msauers: Sorry, you've got the wrong person.
[07:38] xxxxxxxxxxxx: who is this?
[07:38] msauers: Michael Sauers, Aurora, CO
[07:38] xxxxxxxxxxxx: oh sorry
[07:38] msauers: no problem
[07:39] xxxxxxxxxxxx: have a great day
[07:39] msauers: you too

I'm not sure what the moral is here but I do find it polite to assume that someone contacting you via IM is not a spammer. You can always block them if they are. Also, I wonder how many other "msauers" there are out there. I've been using that username for more than ten years now so it's not often I'm confused for someone else.