Every person in the world waits for signs of recognition and affection.
Students wait for signs of friendliness from their teacher; teachers await signs of respect from students. Children want signs of empathy from their parents; parents hunger for affection from their children. A customer wants his needs to be understood; a salesperson needs to feel that his merchandise is appreciated.
So give people what they want!
Sources: Alai Shur, vol.1, p.191; Rabbi Zelig Pliskin’s Gateway to Happiness, p.138