If you have a really valid urgent need to get a passport. You will not need an appointment schedule in order to get one. Waiving of the passport appointment system is reserved for emergency cases only. These cases include the following:
Medical emergency involving the applicant or his/her family member;
Death of a family member/immediate relative;
Infants (1 year old and below) and;
Persons with disabilities.
Note: Applicants with emergency case may go directly to the Office of the Passport Director and bring necessary documents listed in this web link.
Hope you find this useful.