No Call or Travel?

[secondyear]

I have seen the following occur on several occasions, and wanted to know how to call it.

A1 is dribbling the ball and is getting ready to pass, they are able to stop the dribble with one(palming the ball) or two hands, then realize that they don't want to make the pass after the ball has left their hands. Can they retrieve the ball? And if they touch the ball before the ball touches another player is this a travel?

Thanks for the help.