For introduction
[Date] [Name] [Address] Dear [Name] I am writing to let you know how much I appreciated the introduction to [Name]. I had a meeting with him [Her] on [Date] to discuss [Subject], and I am delighted to say that we are now proceeding with the project. Without your introduction this would not have been possible.Thank you. I hope in the future I might be able to return the favor. Yours Sincerely [Your Name] [Your Title]