system
guilty: My friend let me borrow his car yesterday.  I forgot to fill it with gas when I was done with it.
human
My friend was nice enough to let me use his car yesterday.
gpt
That is nice to gave a friend that can help you in time of need.
human
After I returned it, I realized I had forgot to fill it back up with gas.  I feel bad.
gpt
That is not good but my mistake happened.