Oliver smiled as he walked over to her, intending to say 'hi'. He stopped a few feet away from her and laughed a little when he saw just how out of breath the girl was, probably from a long run? the Scot was uite glad to meet a student that wasn't a first year, but those seemed to be the only ones that weren't busy with homework.
He pulled his hands out of his pockets and offered one of them to her, as soon as she had straightened up again and seemed to have regained her breath. "Hey." he said casually and paused for a second as if to think. "I'm Oliver." He introduced himself next.
He looked her over, trying not to make it too obvious, but Oliver was trying to remember if he knew her back from his time at Hogwarts, but he wasn't sure. then again, he'd find out in a second anyway.