overkill

Ok on my driving job quite often I have a situation where I actually have too much overkill, where many people need me at the same time and the problem is, 1 person can't be 2 places at once, so if one or both of them are not cooperative types and not too understanding of my situation... I find...

One my job (driving people), one thing, I'm self-employed so it just me dealing with everyone myself, but beyond even that, I through no easy path set up a schedule to counter the overkill, but the problem I'm facing is I do things with a plan and am organized, but some of the people I deal with...