[DATE, ex. Monday, March 31, 2008]

[NAME, COMPANY AND ADDRESS, ex.
Link Building
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. Link Building],

It was indeed a pleasant surprise to see you at [HOSPITAL, ex. New York General Hospital] [DATE, ex. last week] when I was ill.  I would just like to thank you for taking the time to come and visit.  [MENTION RECOVERY, ex. I have now recovered from the operation; the doctor says I will fully recover in two to three weeks.]

I truly appreciate your consideration.

Best regards,

[YOUR NAME, ex. Jill Jones]