I copied this from a previous post in this forum see if this helps
TO WHOSOEVER IT MAY CONCERN
Date XYZ, 2005
Dear Sir/Madam:
This is to certify that Mr. "RAM AYA NA" is a full-time employee at our company ABC Inc. He is working with us since...... his job title is..... his current annual salary is...... We intend to keep the permanent job offer open for him upon the approval of his application to adjust to permanent resident status.
Ms. Ram AYA Na’s job duties include:
XXXXXXXXXXXXXXXXXXXXXX
We expect to continue employ him.
Accordingly, we respectfully request that you grant his approval of the I-485 application/Immigrant Visa in order for him and his family to obtain their permanent residency status soon. Thank you for your assistance.
Sincerely,
Signature
designation
Company name