You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

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

ASSISTANT: Sure, I am here to help you with that. Could you send me your name?

USER: My name is Benjamin Moore.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Thank you.