Please and Thank You.

As I was leaving the convenience store last night, I held the door open for an Indian girl who was about to enter. She didn't say a word nor expressed any gesture, so I said "you're welcome".
Well, that sure wasn't a first for me.

It's just not in their culture to say Thank You. Then again, it's not in the local culture to push their seats back when they leave the table - nor place their forks, knives, spoons and chopsticks properly on the plate, after a meal at a restaurant.
In fundamental speech and communication, "Please" and "Thank You" are important words, for they showcase just how dignified and cultured a person is.