Aziraphale, while more adept at human interactions than Castiel, wasn't one for joking or sarcasm. The former wasn't his forte, and the latter often went over his head, so he usually didn't bother. He walked over to one of the shelves, pulling the book from it. He didn't even need to think about it, he just knew instinctively where each book was in the store.
"It's really no trouble," he said with a smile, "it is what my shop is here for, after all. If you can't find it in another bookstore, in all likelihood, it's here. Just...please don't come in looking for the book with the vampires who sparkle. I don't carry it." His expression made his distaste for modern fiction clear. "I miss the days when Dracula was the go to vampire novel." He shrugged. "It's strange," he said, smiling. "I'm still getting used to actually selling books. Crowley used to say that I only opened a bookshop in order to keep a lot of books around to read."
He shrugged. "I was on Earth for six millennia," he explained. "I met quite a few people over the years. Aphra was one that I became acquainted with."