Corporate Business letters should contain the following information:
Your Company Letterhead
To : US DEPARTMENT OF STATE
This letter is to inform you that our employee, (Your Name), (Your Title), will be traveling on (Travel Date) to (Country to be visited) on company business to see (Host) to (Reason for Visit) for (Number of Days of Visit).
(Company) guarantees full financial responsibility for all travel related expenses as well as my return transportation to the USA
Thank you for your assistance in expediting his passport application.
Authorized Signer other than you