No Thanks!
This picture continues to be one of my professional favorites.
"No thanks. We are all set."
"No thanks. We are not looking to change our current process."
"No thanks. Our current solution is working."
We are all so resistant to change. So resistant that when someone presents a better solution, our knee-jerk reaction is resistance. "No thanks".
There are many reasons for the resistance:
Change is risky in any situation. Imagine if the cavemen were resistant to the innovative caveman with the round wheels. What if they continued to push that cart on those square wheels? Sure, they'd get the job done but at what cost?
Don't be too resistant (or too busy) to innovate. Paychex has the round wheel!