You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may i abet you?

USER: Due to some health issue, I want to change my existing reservation. Can you please change my reservation?

ASSISTANT: Sure, may I know your name to check the reservation list and revert you?

USER: Sure, I am Kathleen Turner.

ASSISTANT: Ok, please give me a moment.

USER: Sure, I will wait.

ASSISTANT: We could not find any reservation on your name.

USER: Ok.

ASSISTANT: Thank you for reaching us.