Dear Ms Habil,
I am writing this letter to say thank you for your help for my case. I have been your client for more than two years and I am very happy with your service, and especially with A.Yarkova's work who has been in charge of my case.
She has been very friendly, helpful and competent. She has always informed me about all the changes and the has always advised me what action to be taken.
I will reccomend you company to my friends if they need help.
I would like to wish you all the best and very sucessful business in future.