I’ve never read Dale Carnegie’s 1936 classic but within it’s key lessons, I see the characteristics of the successful people I have worked with… 

Six ways to make people like you

• Smile.
• Be a good listener.
• Talk in terms of the other person's interests.
• Make the other person feel important.
• Remember names.
• Become genuinely interested in other people.

http://www.westegg.com/unmaintained/carnegie/win-friends.html