DEAR MISS MANNERS: Is it rude to say "nice to see you again" when someone introduces themselves as if you've never met? You don't really know until you get past this greeting whether someone remembers you or not.
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As a longtime employee, I often remember those I've assisted over the years. I fear I've put people on the spot this way, when I was simply trying to convey some warmth upon seeing them again.
GENTLE READER: Recognizing a returning customer is flattering, but you do have to be prepared if others' memories are not as good as yours.
Miss Manners assumes that people of average acuity, when greeted as you propose, will have the grace to pretend remembering you. If they look surprised, then you may offer minimal additional information ("I helped you when you were here last week") lest they start looking for the exits.