You mostly say it when you are NOT fine, but you don't want anyone to worry about you.
Person 1: Hi, how are you?
Person 2: oh, I'm fine. Just tired.
He is the first child of Eliza and Alexander Hamilton, He was shot in a duel by George Eacker when he was only nineteen years old.
Person1 : Philip Hamilton deserved so much better!
Person2: I know! I can't believe that he died only because George Eacker can't count to ten!