Charming people don't actively (or unknowingly) look to disagree; they look for points of agreement. 

Then, if it's appropriate, they gently share a different point of view, and in that way, help create an outstanding conversation.

Touch can influence behavior, increase the chances of compliance and make the person doing the touching seem more attractive and friendly.

Say you're congratulating someone; shaking hands or (possibly better yet, depending on the situation) patting them gently on the shoulder or upper arm can help reinforce the sincerity of your words.

Charming people don't mind serving as a cautionary tale. They don't mind being a source of laughter, for others and for themselves.

And they're also not afraid to look a little silly. When you own your foibles, people don't laugh at you. They laugh with you. And they realize it's OK to let down their own guards and meet you at a genuine level.

Charming people ask sincere questions that make it easy to answer in a thoughtful, introspective way. They make you think, in a good way, about yourself, and in the process make you feel charming too.

You feel like the most interesting man (or woman) in the world. And you like them for making you feel that way.

If you really want to know how an individual treats people, take him to lunch. How he interacts with the waiter is a much better indication of his interpersonal skills than how he interacts with you.

Charming people treat everyone the same way: as deserving of respect and kindness.

Charming people remember names and even small details, often to a surprising degree. 

The fact they remember instantly makes us feel a little prouder and a little better about ourselves. And that makes us feel better about them.

Charming people may know cool people, but they don't talk about it. And that only adds to their charm.

Charming people already know what they know. They want to know what you know.