[Your Name, & Address here]
[Recipient Name & address here]
I just wanted to say thanks to you for helping me out that day with the [Describe help here in brief].
I must say that you are always the first one who offers a helping hand to a person in trouble. I really don’t know what I would do if you were not with me that day.
It’s only good souls like you who make this community a great place to live.
A huge Thanks to you.