You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Due to sudden change in my plans, I want to cancel my ticket. Can you do this for me?

ASSISTANT: Sure, may I know your good name for checking the reservation status?

USER: Patricia Nelson.

ASSISTANT: Wait a moment please Patricia Nelson.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found with your name.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.