Please do not block an official for turning back an assignment.. Turning back an assignment doesn't mean the official is not available. Most cases the assignors push a game to an official that he does not want to referee that game. And once he turns it back, his time is blocked from calendar. Turning back doesn't mean he is not available. Turning back simply can be, the official does not want to fit that specific assignment in between his schedule. Please leave the official schedule available and if he really wants to block it, he can do it from his own side.. thanks.
DO NOT block the calendar for turning back an assignment