Invitation letters issued by IIT are not required by the US Embassy to issue a B-2 tourist visa. If you have family or friends that would like to visit you in Chicago, you may provide them with your own invitation letter. The letter should include your name, identify the person you are inviting and their relationship to you, and state the duration and purpose of the trip. If you would like assistance writing an invitation letter, you can complete the information below and a template letter will be created for you. You may then print and sign the letter before sending it to your family or friends.