What should the letter say? Start with a clear salutation addressing the consular officer.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. A letter of invitation or Affidavit of Support is not needed to apply for a nonimmigrant tourist visa. We have provided a sample invitation letter for inviting relatives and friends above. You may fill out the highlighted sections using your own information. An invitation is not required and cannot guarantee visa issuance. The following information will assist you in obtaining a visa. Review visa wait times and then visit your local US embassy or consular office website.