A Name

Do you ever look back and feel guilty that you didn't get someones name?  Especially when they helped you? 
Today the kids and I walked to "downtown" for lunch.  The place we picked had a nice outdoor patio where I parked the stroller.  While I was getting my wallet out from the diaper bag in the basket I was debating in my head whether to try and leave the kids outside (strapped in the stroller with my oldest in charge to watch the younger) or to just cart them inside.  I was leaning toward taking them inside when an older lady who was sitting outside said that she would stay outside with them.
She kindly moved her chair over then jumped right into asking the kids questions, I'm betting she has grand kids!
At this point I went right in without kids (reminder that I live in a small town and ''Downtown" is 4 square blocks and I could walk there from my house in 20 minutes.)
I was able to get everything ordered and carried out without having to try and balance a stroller, a crying child, wandering little fingers, and the food.  IT WAS GREAT!
Once I got outside she talked to me just a little bit as she got her stuff together then excused herself, saying goodbye by name to my kids.
I did tell her thank you, but as she was walking away (especially when she addressed my son by name) the thought that I didn't even establish any sort of common ground between her and I, like introducing myself and exchanging names.  Was that rude?
Here she did me a great favor and I didn't even get her name.
Again because I live in a small town there is a chance I would see her again, and knowing her name may let her know that because of the small act of service to me, I remembered who she was.
Lesson to learn for next time maybe!