People breaking dates

It really annoys me when people make plans with me and then cancel or are late to the date. This happened to me just the other day and I had to man a booth with just me and one other person instead of the three that were supposed to be there. It's completely selfish and disrespectful of the other person's time. I'm never late and I always go to events that I make dates for. Unfortunately most people aren't as organized as myself.