This is Noah Durand, a mage from Orlais who might be the one patching your character up if she's injured and he's in the vicinity. He wouldn't have seen a lot of Denerim so he might be asking her a lot of questions, since he's curious about the world outside the tower.
I don't know why, but I'm getting the feel of a mentor-type relationship. Anything you'd wanna know is in Noah's profile if you want to start something up.