Then if someone says "thank you" in Creole, I will answer how?

You're welcome. or Don't mention it.
De ryen.
Padekwa.

My pleasure
Se te tout plèzi mwen.

Forget it.
Pa okipe w.

No problem
Pa gen pwoblèm.

It was nothing.
Se pa't anyen.

It was nothing at all.
Se pa't anyen ditou.