"Oh hey," Sam nodded and flashed a smile in response to the greeting. He offered a hand to shake, if she were inclined, his other hand hanging at his side.
"I'm Sam. I'd like to volunteer. If you're looking for help at the moment," he told her. He wouldn't have blamed her if she thought he came looking for help, instead of looking to help, but that wasn't the case at all. He had a few hours to spare and wanted to use them for good.