Oh? [Still with the cool, pleasant smile, he raises his eyebrows faintly. Aside from the occasional woman fawning over him (which this doesn't seem to be? hopefully not) people are usually not this happy to see him. That's intriguing in and of itself.
Even so his response is in Eternal Servant Mode, as if expecting she wants him for some menial task (and honestly, whatever he does expect, it's assuredly not the pleasure of his company).]
How can I help you? [He could probably add that he'd be able to accommodate her during the day despite his all his keeping busy, but let's not encourage people to bother him incessantly. Besides, if she'd wanted to talk to him out among people, she'd probably have done so already, right?]