Stop crossfadealpha

I'm trying to find a way to stop/disable/end the crossfadealpha method. Basically I have a user notification that I enable, wait a second, and then start fading out, but I want to stop the fade if I retrigger the notification before it is done fading out.

I can't figure out if it's possible to do this. Anyone know of a way to do this? Or do I need to go full manual and lerp the alpha in my update method?