Here you go:
Dear FrustratedQP
Thank you for taking the time to contact us.
We were concerned to learn about your recent experience with Qantas, and that you did not receive the level of service expected from a premium airline.
We strive to provide exceptional service and customer feedback plays an important role in our continuous improvement process. It also helps us strengthen our commitment to customer service. We would like to assure you that your feedback has been forwarded to the relevant management as part of this process.
Thank you again for taking the time to write. We value your ongoing loyalty, and hope that we have an opportunity to welcome you onboard Qantas in the near future.
Kind regards,
Qantas Customer Care
Insert after taking the time to write in last paragraph:
"We are committed to creating the world’s best flying experience and your feedback will help us make the improvements required to achieve this goal."