Treat people the way you want to be treated
Are you upset with the way people treat you? Are your customers unhappy? Do you feel left out? It is because the way you treat them. It is no magic but a golden rule of moral conduct. Treat people the way you would like to be treated. It could be greeting your customer, or to your boss, or to your secretary or to your children. This is no magic, it is theory of reciprocity. Your surroundings reflect yourself. Ask yourself before you react to any situation, how would I feel if I was in the same situation?