You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, will you please let me know your name?

USER: Myself Michael Evans.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.