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

Dear [NAME, ex. John Smith], 

I was excited to hear about your period of sabbatical.

I'm particularly envious of your choice of location - I hear [NAME OF LOCATION, ex. Southern California] is particularly scenic and the weather is terrific. Please be sure to think of us huddled in the cold back home. 

Please let me know if there is anything I can do for you while you're gone. Take care and see you soon!

Best regards,

[YOUR NAME, ex. John Jones]