Don't let it bother you; put it out of your mind.
I don't want to continue with this conversation (usually used in frustration or anger).
It doesn't matter.
A conventional reply to an expression of gratitude.
Absolutely not; I forbid it or it is impossible.
Used similarly to you're welcome, as a conventional reply to an expression of gratitude.
Don't worry about it (response to worry or an apology)
Not in the least.