Another one of the best SA experiences I had was in the
Louis Vuitton on Champs Elysees in Paris. Not only were they really busy - it was around Christmas time so they had throngs of tourists gawking and buying only monogram
Anyway I was after a bag which at the time was pretty hard to get hold of - the SA found one for me, and looked in the database for other colours so he could get it couriered to the store if I'd prefer them, plus when I wasn't sure he let me put it on hold for a couple of days, even though there were customers who came up to me the whooole time saying they'll buy it straightaway if I didn't want it.