You're
good. No problem, it's all good.
Don't worry about it.
That's okay, no big deal.
It's fine, no harm done.
No need to apologize, really.
I understand, no sweat.
No worries, I've already forgotten about it.
It's all good, let's move on.
No problem at all, don't give it another thought.
It's alright, we're cool.