I just wanted to drop you a short note to let you know how pleased I was with your services.  It was the best family trip we have ever been on!
 EVERYTHING that you planned went off "without a hitch".  It was especially comforting when I did have a question about one of my flights your Australian office assisted me immediately. I was impressed that they knew exactly who I was, where I was staying at the time of the call and was very professional. 
I'm not always easy to please and I've been told that I have high standards that are sometimes not easy to meet but you exceeded my expectations!
Jeff W