Q1) I'm sorry.

That's all right.
Think nothing of it.
It's nothing.
Not at all.
Think nothing of it.

Q2) Thank you.
You're welcome.
Don't mention it.
Not at all.
It's my pleasure.
It's nothing.

Are the answers to the two questions all correct?
Would you add some more suitable answers?

1 answer

On the first set, "That's fine or That's O.K."

The expression "Not at all" is awkward in both sets.