You must provide one of the below for your passport processing.
PLANE TICKET OR TRAVEL ITINERARY
A copy of your plane ticket, airline email confirmation, or travel itinerary generated by a travel agency showing your name and date of travel.
BUSINESS LETTER
Business travelers may provide a business letter if neither of the above is available.
EMPLOYMENT PURPOSE TRAVEL
If you need your passport for employment purposes, a substantiating letter from the HR department of your company may also be required.