"Oh ah-" Stan started and stopped, it was obvious she wasn't from town, far from it in fact by the looks of her, so her order was something that was a little bit outside the realm of his abilities in a place like this. And if he was being entirely honest he didn't actually know what that was.
"Can I interest you in an espresso?" He suggested instead, hoping maybe he wasn't too off the mark, as for sizes well - they didn't really do sizes here, they had mugs and so everything was mug sized, the way coffee was supposed to be in his estimation. "Maybe a christmas cookie too?" He offered, "They're made locally." Not by him of course, but that wasn't important, he stuck to what he knew, and well that was mostly beverages.
But they were very good cookies and he hoped they'd smooth over any sort of annoyances that he didn't have whatever it was she was after.