To appoint is to assign a role or position.
Also to designate a time and a place.
To be "dis-appointed" is to be removed from a role. To not belong is to die, so losing our roles in life feels like death.
This though: Appointments can be agreed to, can be kept, and can also - be changed.
Choose your appointments and keep them. Or change them.
Then dis-appointments too is yours to choose.