【单选题】

From: Keiiysimpson

TO: Fishpond Travel
Subject: MyExperience
Dear Fishpond Travel representative,
I’m emailing to congratulate Fishpond Travel on the excellent service that this company provides. My initial contact with the company came after I saw an advertisement in a store front window for flights to Thailand for just $655 per person. My husband and I were about to celebrate our 15th anniversary, and I thought a trip to Thailand would be the perfect way to spend this special occasion. I immediately booked our flights with the help of one of the friendly Fishpond Travel assistants at theCivic branch.
However, two days before we were due to leave, my husband became ill, and we had to cancel the trip. I called Fishpond Travel to let them know, expecting that we would still be charged the full price, as this has been my experience with other travel agencies.But the people at Fishpond Travel were much more understanding. We were given the chance to rebook our trip two weeks later for no additional charge. We later went to Thailand and had a fabulous vacation.
Thanks once again to the wonderful staff of Fishpond Travel. I will spread the word about your outstanding customer service.
All the best,
Kelly Simpson
What is the main purpose of this emailA．To make a customer service complaint
B．To congratulate on winning an award
C．To request a special service
D．To express gratitude to a company