You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, may I know your name for the changing process?

USER: My name is Patricia Moore.

ASSISTANT: Sorry, we regret to inform you that there is no active reservation found on your name in our database.

USER: Thank you.