Put it in the middle of a reaction edit, right where the decision flips to yes. Lead in with a huh sound for the confusion beat, run this clip for the agreement, then follow it with no no wait wait for the sudden reversal.
Über diesen Sound
This clip is a voice repeating 'ok' over and over for just under six seconds, each one tumbling out faster in a flat, resigned tone. It feels funny and exasperated at once, like someone giving in, pretending to agree, or trying to end an argument they have already lost in their head.