Branwen smiled in as friendly a way as she could without being irritatingly bright. "I'm Branwen. It's nice to meet you." While Branwen was by no means a social girl, she wasn't awkward in meeting someone new if she knew who they were a little bit, or her curiosity had broken that barrier despite herself.
"I don't think I've seen you around much before, and I know you aren't in any of my classes. What year are you in?" It was conversationally lightly said, but Branwen was genuinely confused. She was pretty sure she could identify all of the seventh-year Slytherins on sight, but she wasn't one of them - and at any rate, she looked to be too young for that, and this was past OWL level Potions work.