Suppose you are talking to some then you shouldn't talk about the things you disapprove. You must emphasize  on and keep on emphasizing on things you both agree ,as if both of you are on the same page. You must keeping on saying the agree points so that to show that if possible that you both have same purpose and the only difference is of 1 or 2 points not the purpose.

You have to make the other person  "yes, yes" from the very beginning .You must keep your opponent away from saying "no".

According to a scientist  a “NO” response is very difficult to overcome and in case you said no then your whole personality stand or act as a barrier and your personality demands to stay consistent to it. You may later feel like You shouldn't have said NO to it. once you have said it your whole body/organ/cell will feel to stick with it. Therefore it is of great importance that a person should start in a affirmative way/direction.

A good and adroit speaker should focus on getting as many yes possible .This will going to set the listener to get attracted to the speaker and move in the affirmative direction. It is similar to the billiard ball game ,if you direct it with with small force it will deflect to your willing direction and get inside the pocket and if it is forcefully directed that it will return back in the opposite direction.

The use of this "yes, yes" technique saved a bank employee from losing one of his potential client in new London who might otherwise have been lost which must have caused huge loss to that bank.
A man named Joseph came in to open the bank account. Joseph willing filled out the form given by the bank employee and answered to few questions and plainly refused to answer others. Bank employee requested/enquired and even forced him to give the necessary information but joseph seemed to deny from answering.

Then the bank employee reported the same to bank manager .Bank manager adroitly handled the matter without refusing to accept the joseph account.

Bank manager approached joseph and explained to joseph that suppose you have money in bank after you death .Wouldn't you want to transfer it to your kin?

Joseph replied "YES" I want to transfer.

again manager said that don't you think you must give us the name of your kin and all the details to smoothly run the process?

Joseph replied "YES" again.

Hence by getting yes and starting the conversation on agreed things and affirmative direction the bank manager saved the bank from loosing the potential client.