You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: My name is Edward White.

ASSISTANT:  I am very sorry to inform you that there is no reservation found under your name in our database.

USER: Thank you.

ASSISTANT: Thank you for reaching us.