You must provide one of the below for your passport processing.
Please note:typically the letters below are acceptable as proof of travel to the US Department of State, but it remains up to their discretion if it will be accepted or not.
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 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.