Here is an example of official Invitation Letter to Conference - Formal Invitation Letter. Your are advised to modify this letter to be suitable for your purpose
Subject: Invitation To The 3rd Annual Conference Of [Conference Name]
Dear [Insert Name],
Greetings from [Insert capital city and country]. We would like to invite you to attend the [Conference name] of [city/country], which is held from [date] to date].
You will be provided round trip tickets, and accommodation during your stay in [city] from [date] to date]. It would be also most appreciative if you could have your confirmation of the flight in the near future.
Please give us your full name and send us scanned copy of your passport in order to book your ticket. Please send them to this email[insert email].Our official hotel is [hotel name] in which you will be stay throughout the conference. We will send you the working schedule very soon.
Again, may I take this opportunity to extend a cordial invitation to you from our country. I am looking forward to welcoming you in [city]. Should further detailed information be required, please do not hesitate to contact me to the address below.
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