You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: May I know your  good name to check the reservation status?

USER: Sure, I am Charles Gonzalez.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

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

ASSISTANT: Thank you for opting us.