"Thank you just doesn't seem enough. The gratitude I feel.  I cannot show.  For the patience when I had to call. You all give a new meaning to the word 'professional'.  To be able to deal with death, the families, many emotions that go with your job.  You are all truly a team like no other." 

"You folks were all so good and caring; I will never forget you folks.  Words cannot say enough to express my gratitude." 

"Thank you for your support and guidance.  We don't know how we could have honored my huband's wishes without you.  Words cannot express how thankful we are for you.  Merci Beaucoup."