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