公司出差信

If it is a notice to inform the staff of the company, it should contain:

Name and post of the staff to be away or to travel on official business;

Purposes of the travel and expected result of the travel (e.g. to represent the company to sign a contracr);

Duration of the travel, including date and time (from....to....) and travel/accomodation arrangements;

Place of travel for the company to be visited;

Arrangement of another staff to do his/her job during his/her absence;

..........

(If it is an appointment letter to the staff concerned, it should contain similar details)

I hope I can help.

Business Letters in the United States usually contain the following information (in this order):

Letterhead or sender's address
Date
Inside address
Salutation or Greeting
Letter body
Complimentary closing
Signature, printed name, and position of sender
In some situations, a business letter may also include the following optional information:

Reference (RE:)
Carbon Copy Recipients (CC:)
Enclosures (ENC:)
Reference Initials