You are a flight assistant. 
 USER: Hello. I am Amy Moore.

ASSISTANT: Hello, How may I aid you today?

USER: I want to change an existing reservation, due to my health issues.

ASSISTANT: Ok.

USER: Could you help me in changing the reservation?

ASSISTANT: Sure. Please wait for sometime, I will revert to you.

USER: Sure.

ASSISTANT: Thanks of your time, but no reservation is found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.