Letters of Explanation should include the following information:
To : U.S. Department of State
(DATE)
Dear Sirs/Madam:
This letter is to inform you that I (Your Name) will be traveling on (Travel Date) to (Country to be visited) on vacation.
(Reason Why) In order to book my international flight I must have a valid passport therefore, I am applying now without an itinerary.Thank you for your assistance in expediting my passport application.
Sincerely,
Original Signature
Phone Number