You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, what kind of service you are expecting from us?

USER: Owing to an emergency, I need to cancel my recent reservation. I am Raymond Miller.

ASSISTANT: ok, I can help you. please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

USER: Thanks.

ASSISTANT: Thanks for reaching us, have a nice day.