Dear
The fact that you will be leaving our firm shortly has
been brought to my attention. We are very sorry to lose
you inasmuch as your work has always been most
satisfactory and we were hoping that you would remain
with the (name of firm) for many years. I understand
that you are leaving for personal reasons that have
nothing to do with this organization.

I will be happy to provide you with a letter of
recommendation, if you so request. You may find this
helpful in securing a position with another firm in your
new locale. Please advise my secretary of your intent in
this matter, so that we can have it prepared for you
before your departure.

I know that I speak for everyone here at (name of firm)
in wishing you the very best of luck in the future.