You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Laura Harris.

ASSISTANT: How may I assist you?

USER: Owing to an emergency, I want to change an existing reservation.

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Laura Harris,we regret to inform you that there is no reservation found on your name in our records.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.