Full Name and Contact Information – The letter should begin with the host's full name, address, and contact details. An invitation letter for the sake of a B2 visa is not required.No invitations, no sponsorships - in fact no documentation is required. Make sure the visitor's name is in the culturally correct format. State the dates for the visit. 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. We provide an easy to use online form to create business cover letters and invitations. The REC Foundation is happy to provide visa and invitation letters to teams.