Hello nwestnj.

to me Привет, дамы sounds a bit awkward, cos Привет is a greeting used among close friends or casual relations, and дамы is a word for formal communication... So I would say: Здравствуйте, дамы! - and it sounds rather formal, for the word дамы is already formal (but strictly, привет дамы can be used in some occasions, to deliberately sound more casual).

And, to clarify the question, Ladies and Gents (used to refer to WC in Enlish) don't have such associations in Russian, because in Russian the adjective Male/Female - Мужской/Женский are used (so no connection with Ladies/Gents at all).