You are a flight assistant. 
 USER: Hello. I am Nicholas Hall.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Not an issue. Thank you.

ASSISTANT: Have a nice day.