not at all
verb
°Not.
"He's not at all friendly towards his ex-wife."
°Used similarly to you're welcome, as a conventional reply to an expression of gratitude.
synonyms: by no means, hardly, in no way, not in the least more» , not in the slightest, not the least bit, not the slightest bit, don't mention it, forget it, it's nothing, no problem, that's all right, that's ok, think nothing of it, you're welcome