Full Name and Contact Information – The letter should begin with the host's full name, address, and contact details. Although not a requirement, your U.S. host can write a letter.We've provided a sample invitation letter for a B-2 visitor visa. A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. An invitation is not required and cannot guarantee visa issuance. There is no requirement for an invitation letter. If you want to send on send it to your parents who in turn may present it to the US consulate. What should your Invitation Letter for a Visa include? Clearly state the purpose of the applicant's intended visit to the United States, along with the proposed dates of their arrival and departure. Please fill out the following form in its entirety.