You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, I am glad to help you with that. Please give me a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am Brian Phillips.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Thanks.

ASSISTANT: Thank you for reaching us.