Dear Mr. Martin,
Thanks to your kind efforts, my America plan has come a great deal further. I received a very nice letter from the American Friends Service Committee which gave me great hope and a lot of useful advice. They also sent me the conditions for the acquisition of an American student visa. The Friends Service Committee is going to try to gain admission for me into a university, for which I have sent them the required documents, like my résumé and photos. In the last few days I have received confirmation of my letter as well as their assurance that they will try to help me.
I would like to express to you my sincere thanks for your efforts. Without your help I would not have come this far. Please also give my regards to your family.
With warmest regards,