Customs and habits of usa

Miss, Ms. or Mrs. There seems to be some controversy, perhaps regional, over the usage of Miss (pronounced "miss"), Ms. (pronounced "miz") or Mrs. (pronounced "miss-iz"). Generally speaking, it is polite to call a lady Ms. at first, unless you are prompted otherwise. An American woman will let you know what she wants to be called, or if she wants to let you know she is married.
"Sir" and "Madam." Many countries outside the USA use the term "Sir" or "Madam" when greeting someone new, and it is a respectful introduction before the person's details are known. Within most of the U.S. "Madam" is only heard as a title for an elected person ("Madam Secretary [of State]"). In the military, a man of higher rank is addressed as "sir" and woman of higher rank is addressed as ma'am. However, it is not uncommon to hear sales people interact with their customers using these expressions of courtesy. In some households children are still taught to always address adults by including "sir" or "ma'am". The word "Lady..." is not ever used to gain the attention of a woman or address her directly. "Miss" or "Ma'am" is correct.
No means NO in big block letters, not ask again. American women do not always dress in a way that is considered modest or respectful in another country, but it could be quite acceptable in the region where they live. Short skirts, sleeveless blouses, wearing makeup or perfume is not automatically considered provocative. Behaviors such as smiling at you or showing cleavage is also considered ordinary and acceptable in most cases and IT DOES NOT NECESSARILY MEAN SHE WANTS SEXUAL ATTENTION AND IT REALLY, REALLY DOESN'T MEAN SHE WANTS TO BE TOUCHED. Women are legally, politically, and professionally the equal of a man in America. The way a woman dresses is a sign of her style and femininity primarily. It is a very, VERY big mistake to assume anything else. If you attempt to make advances and she reacts with surprise or negativity it really, truly, undoubtedly means no, never, not going to happen.
As a warning to those from East Asia, India, Russia, the Middle East, or parts of Eastern Europe, many a man has found he has gotten a good hard slap across the face or a kick in the crotch for mistaking a woman's mode of dress as an invitation for his attention. Business deals have been irrevocably lost because some fool tried to proposition a woman in a low cut business suit in the elevator...and found out she was the CEO! 
So-called "Eve teasing" as practiced in India and other areas of the world is absolutely 100% out of bounds and can land a young man in a great deal of trouble with the law. It falls under the legal code of most states as sexual harassment and can lose a man his job, his freedom, or possibly his dignity. Furthermore, a woman is legally allowed to defend herself if assaulted and persisting in making unwanted advances may result in a crowd of angry men sorting you out, that's if the woman hasn't already done so herself by using something called "pepper spray", which is somewhat like tear gas.