But, really, the script you're meant to follow goes like this:
Hey how are you?
Hey, good, how about you?
Pretty good
Then, if the conversation is meant to continue, which it most often is not, one of you says "So ... what's up in your life?" or "So ... how's that thing you're working on going?" or some other more specific question.Edit: let’s also not forget that “howdy” is a shortened version of “how do you do”