Dear John,
I hope you are in the best of health and in high spirits. I am Garry, the person you brought to the hospital after an accident on Bank street. I am blessed to meet such a nice person and impressed immensely by you, and so I am writing to express my gratitude.
I believe you were an angel sent for me to bring me to the hospital in time. Otherwise, I would have lost much blood and possibly could die. I do not remember after I was hit from the back by another car while riding my bike. When I opened my eyes, I found myself in the hospital with you standing beside me. I came to know from doctors and nurses that your first aid helped me stop bleeding from my leg.
I am so thankful to you and can never pay you back in any shape. My wife and I decided to invite you and your family to dinner next week. Please let me know about your schedule so that I can plan accordingly. I hope you will have a wonderful time with us, and my son is waiting eagerly to meet you.
Once again, I am thankful to you for this act of kindness.
Yours sincerely,
XYZ
Dear John,
I hope you are in the best of health and in high spirits. I am Garry, the person you brought to the hospital after an accident on Bank street.  
I
  am blessed
 to  
meet
 such a nice person and impressed  
immensely
 by you, and  
so
 I am writing to express my gratitude. 
I
 believe you were an angel  
sent
 for me to bring me to the hospital in time.  
Otherwise
, I would have lost much blood and  
possibly
 could  
die
. I do not remember after I  
was hit
 from the back by another car while riding my bike. When I opened my eyes, I found myself in the hospital with you standing beside me. I came to know from doctors and nurses that your  
first
 aid  
helped
 me  
stop
 bleeding from my leg.
I am  
so
 thankful to you and can never pay you back in any shape. My wife and I decided to invite you and your family to dinner  
next
 week.  
Please
  let
 me know about your schedule  
so
 that I can plan  
accordingly
. I hope you will have a wonderful time with us, and my son is waiting  
eagerly
 to  
meet
 you.
Once again, I am thankful to you for this act of kindness.
Yours  
sincerely
,
XYZ