ask questions and ask permission prior. For example, I understand youre not interested,could I ask you a parting question? Rather than talking off a script or trying to bulldoze people.

Stand up when you are about to close something.

mimic their tone and voice. If they speak slow and deep, you do the same. If they speak quick and whiny you do the same.

never call a woman a man or vice versa.

learn to pronounce names properly.

there are lots and lots of tips out there. Any businessman worth his weight knows how to pound a phone and sell, not be an order taker.