You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my recent reservation owing to an emergency.

ASSISTANT: May I know your name to proceed further?

USER: Frank Collins.

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 choosing us.