As someone who writes books, I'd normally use quotation marks, and the person is obviously talking, so the first one should be correct.
Answer:
I don't quite understand what this is about, but if it's like a like a letter to a friend about you being in the Olympics in third grade or for a third grader reading about the Olympics.
Explanation:
I guess if it's for a third grader, I'm reading about the Olympics, I don't know.
