In general, when you want someone to do something for you, whether it be signing a contract or selling you some vegetables in the market, if you are the one doing the asking, you must first tell the person serving you "bonjour," or "good day!"
一般說來，舉凡要他人替你辦事，不管大至簽約、小至上菜場買菜。身為客人者，都要先主動和服務人員說：「您好（bonjour）」，然後，才提出服務事項的要求。