Fred smiled when she seemed to perk up at his compliment. He went to the desk and took a position that would like he was sitting on the desk (he was really floating about three inches above it), to make it less obvious that he was a ghost. Him being a ghost didn't seem to endear people to talking to him.
Fred nodded eagerly at her question. "Yeah, I was beater for Gryffindor since second year. You were always my favorite player." Fred had actually idolized her. He had seen her play while she was here, and she was the whole reason he'd tried out for beater, instead of keeper or anything else. No way was he going to tell her that though. Didn't want her thinking he had some huge ghost-y crush on her. How creepy would that be?