Dear colleaque I would like to have a sample of letter of introduction of a company to a company for a service

Hi, deslva!

If you look down at the bottom of this page, you'll find links to question that have been similar to yours. You might want to click on the links to see what some of the answers have been.

Concerning your specific needs though, if you would like to start a draft copy of an introduction letter on this thread, without putting in any identifying information, I'm sure that there will be those of us who would be willing to advise you as to how you could make improvements to your letter.

Thanks!