You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Parker.

ASSISTANT: What type of guidance do you need from our flight ticket booking agency?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please change my ticket?

ASSISTANT: Sure, I am here to help you. Can you please confirm me whether you want to cancel the ticket or change the existing ticket?

USER: I want to change my reservation?

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to  inform you, there is no active reservation found under your name to modify the details.

USER: That's fine. Thank you for your service.

ASSISTANT: You are welcome. Have a nice day.