Hi. I am Carolyn Mitchell.
Hello, how may I aid you for the day?
I have reserved a ticket earlier but due to my illness I want to change my reservation. Can you help me out?
Sure, I will help you with that.
Thank you.
Please wait a moment, I will check your reservation status and get back to you.
Sure, take your time.
Sorry, to inform you that  there is no reservation found on your name.
No issues, thank you for the information.
Thank you for opting us.