You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Emily Baker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Most welcome.