Originally Posted by TiredSoul

Give them a gentle nudge about flight plans, ATC delays, 'fitting in the system' blah blah blah depending on how knowledgeable they are.
Have your dispatcher call their broker.
Try and stay out of the direct communications as you don't want to be the 'trouble maker' when they finally show up.
I've even been acccused of being st the wrong FBO.
Yeah right lol