Demelza flushed slightly, embarassed. Now she realized that she sounded slightly stupid. There weren't that many people around, and having been in the castle for years, of course they'd have passed in the halls. Stating the obvious wasn't the brightest thing to do. And when talking to a Ravenclaw, you needed to avoid saying stupid things.
However, that embarrassment vanished at the mention of Quidditch. "Yes," she replied eagerly, "I play Chaser. I absolutely love it." She wouldn't mention the team's record, she wouldn't! It wasn't good form.