Hello.
user
Hello, how can I help you today?
assistant
 I am John Davis. I want to cancel my reservation due to prepone of my appointment with doctor. Can you help me with it?
user
Sure, please hold on a moment.
assistant
Ok.
user
Thanks for holding on, no flight reservation found with your given name.
assistant
Thank you for your response.
user
Thank you for opting us.
assistant