One time I was playing basketball and I accidentally slapped a girl in the face. I felt so bad about it.
I accidentally slapped someone in the face while I was playing basketball.
user
Oh no, did they get angry? 
assistant
No, I think she was just a little shocked by it. I felt so bad.
user
Okay, I am glad that they were not angry. and I am sure they knew it was unintentional so don't feel too guilty about it. :) 
assistant