Clever conversation, aka "witty [reh-par-tay]" ... can't for the life of me remember how to spell that loan word, though I use it in spoken English from time to time.
I am pretty sure it's not repertoire.
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That word would be repartee. (Since it's French, I've sometimes seen it spelled with an accented e, repartée, even though it's not necessarily supposed to have one.)