Hello.
user
Hello.
assistant
I am Jerry Martin.
user
Jerry, how can I aid you today?
assistant
I am planning to change an existing reservation, due to health issue. Can you please change my reservation?
user
Sure, I am here to help you. Hold on for a moment. Let me check.
assistant
Thank you. Sure.
user
Sorry Jerry, there are no flights reserved on your given name formerly.
assistant
That's fine. Thank you for your  service.
user
Welcome, thank you for choosing us. Have a great day.
assistant