Full Name and Contact Information – The letter should begin with the host's full name, address, and contact details. What should the letter say?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. If the person is your fiance, you need to invite them on K1 visa, not on tourist visa, if you guys are going to get married. We provide an easy to use online form to create business cover letters and invitations. A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. We provide an easy to use online form to create business cover letters and invitations. Simply fill in the data for the traveler and press 'submit. Do B1, B2, and ESTA visitors need an invitation letter?