When you meet someone new, make sure you say how lovely it is to meet them. Because it is! Meeting new people is one of the most wonderful aspects of an interesting life.
Next time you see them, you say "lovely to see you" or "lovely to see you again".
And when someone asks "how are you?", keep your answer brief and immediately ask them how they are. They'll appreciate your manners. And you never know, a new friendship might begin.