Forgive AND forget?

[WCW]

I have an issue I could use help with please.
Background - I have a full time career/job in town, and at home run a ranch/farm/livestock/merchandise/service business along with repair and maintanance on buildings, home, fences, barns, arenas, equipment, etc. H doesn't help too much and has his own business's that can keep him hopping.

I have people that help me out, some I outright pay and some I trade my help with their horses for them to help me with things.

My irritation is that people don't respect my time and my schedule. I usually let people tell me when they can come for help or to work, but when a time or day is set up I set that time aside for them and expect it to happen.

Last night I had -
one guy scheduled for fence work in the afteroon/early evening
one guy scheduled for spraying weeds afternoon/evening
one girl/father for lessons at 4pm
one lady for lessons at 6pm
one lady for lessons at 7pm

Except for 2, the rest canceled. I get so irritated and so very frustrated! I set aside MY time for THEM, and then I get stood up. Not only is it my time, but the work doesn't get done either. I have to reschedule the work and lessons and acommodate everyone time and time again.

How can I tactfully but politely tell folks how screwed I feel when they do this? Last night was just one example, but it happens at least weekly.
Do I have a 'no show' fee if they cancel?
Do I just say please respect my schedule and don't let it happen again?
Do I say screw you don't come back?

This frustration flows over into my attitude about the rest of my life too.