Date: March 15th, 2010
Dear Mr. John Brown,(壹般正確的寫法是given name和family name都寫上）
Well received you letter on March 12. We're hornered to invite you vist our company for discussing collaboration details, if you're available on 25th this month, please advise your flight informations, my collegue Ms. Lee will pick you up at the airport accordingly.
Look forward to seeing you soon.
Best Regards,
XXX