"But you've giving me the honor of your company!" Two could play at that argumentative game, and while Aziraphale very much liked being treated to meals and spoiled, she was kind enough to spend time with him...he wasn't going to take advantage of that kindness. (Someday he may well find this interaction very ironic)

"You did, yes, though I hardly think I'm very memorable. I remember you, however. Or at least this last month, but I don't recall seeing you before then. Are you new to the meetings?"