Schedule Your Trip Full Service Travel Request Self Service Online Booking Please Note: Amtrak cannot be booked online. Use the Full Service Travel Request link for Amtrak. Call A Travel Advisor Print A Fax Form Your Dedicated Office WorldTravelService6010 Executive BlvdSuite 202Rockville, MD 20852 Email Travel Request: NIH@worldtravelservice.com To Cancel Reservation: cancel@worldtravelservice.com Customer Service: mgt@worldtravelservice.com Hours: M-F 8am-7pm ESTPhone: 1 (301) 816-8991FAX: 1 (301) 816-0715Toll Free: 1 (800) 638-8500 After Hours:1 (877) 853-36481 (516) 730-2648 (Outside the USA) Get the latest public health information from CDC Get the latest research information from NIH Real ID – State Minimum Security Standards Asia