Send the tail number and the FBO
Private flights are tracked by tail number, not flight number, and a single airport can have several FBOs a long way apart. We need both to be in the right place.
Timing around an unscheduled departure
Private schedules move. Give dispatch a rough window rather than a precise minute and the chauffeur will stage nearby, ready to pull up when the aircraft is on the ground.
Discretion
Chauffeurs on private aviation work do not discuss passengers or destinations. If you need it in writing, ask for a non-disclosure agreement before the booking.