You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Charles Miller. Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, I am here to help you in cancelling the flight ticket.

USER: Thank you.

ASSISTANT: Sorry Miller, there is no active reservation on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.