You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Daniel King.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are was no reservation found on your name.

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

ASSISTANT: Thank you for opting us.