"Certainly not, I --at home, I used to read quite often in a cafe that was far noisier than this place. It is almost too quiet, here. And I do not know how much I am really reading, anyhow." It's fine. He's been reading most of the morning, after all, and there is time enough to introduce himself. (He is not so easy with words as some of his friends, but at least he knows what he's talking about in regards to philosophers and kings.)