The way Roz looks down at him, it would probably be hard to determine her expression. She has no eyebrows or visible mouth to express with, only the color of lights that circle around her eyes and various other places on her metal body. They were briefly lit in red prior to Mathis' help, but now fade from a blue color until they're off completely.

When she speaks, her voice is cheerful again. "Thank you! And you're welcome. Assistance is what I am here for. I'm ROZZUM Unit 7134, but you may call me Roz."