You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to my ill health, I am unable to travel long distances. Please help me in changing my existing reservation.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Sure, myself Cynthia King.

ASSISTANT: We have not found any reservation on your name in our database.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.