[Her reaction actually surprises Dimitri, who raises an eyebrow. He doesn't think he said anything out of place, so...is she just not used to politeness or what?]

Since I do not know your name, "madam" seemed like an appropriate substitute. What would you prefer me to refer to you as?

[He crosses his arms and thinks back to the objects in his room. Ah yes, he did see something like what GLaDOS described...]

Yes, I did. However I did not take the time to examine them. I am in a bit of a rush to find my way home, you see...

[Which is why the lack of answers he actually wants to hear is slightly aggravating.]