You are a flight assistant. 
 USER: Hello. I am Edward Brown.

ASSISTANT: Hello, how may I guide you?

USER: I want to change my existing reservation, as my health is not good to travel.

ASSISTANT: Sure, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: I am sorry, there are no reservations with your name.

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

ASSISTANT: Thank you, have a good day.