Once upon a time there were carrier pigeons:
YouTube video – humorous version
A few hundred years later we added pony express for communication:
We used morse code with a telegraph:
A phone was invented:
We had access to fax machines:
Cell phones came into the market:
It wasn’t long till we could email to communicate:
The question is — why can’t people have the courtesy to contact someone when they change their mind about showing up for an appointment?!
There are a multitude of efficient ways to communicate. Find one and be courteous to other people.