You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Owning to an emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure. May I know your name please?

USER: Sure, I am Anthony Miller.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry I could not find your flight reservation to change it.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for checking.