41 C.F.R. § 301-71.103

Travel authorizations must include:

(a) Name(s) of employee(s);

(b) Signature of the proper authorizing official;

(c) Purpose of travel;

(d) Conditions or limitations of the authorization;

(f) Estimated travel costs (including estimated costs for the entire period for open authorizations); and

(g) A statement confirming the employee(s) is/are authorized to travel.