Show slots that are curently in cart with a warning on the frontend calendar

[Valentina R]

is there a way to add “Someone else is checking this slot right now.”?

my goal with this is to notify potential clients that want the same time on that date that the time is already taken by another client but not yet paid/in cart. We hope that this way, they can wait for a few more hours and try again than book on a later date.

Is this even possible? probably not? Requested here.