Courtesy and Consideration
How nice it is to hear thank you from someone. When someone smiles it is almost immediate that a smile comes back. Holding a door whether a man or a woman for anyone but especially for someone that needs a little help is simply just kind. Saying you appreciate what someone has done allows that person to see that you noticed. The use of the word please is just being considerate.
When people use a little consideration for each other the day seems easier to take, and most of the time is very pleasant. When people show respect for each other every one wins.