You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have cancelled my plan to attend to my friend's marriage. So, I need to cancel my ticket. Can you help me in cancelling a ticket?

ASSISTANT: Sure, please mention your name?

USER: I am Karen Brown.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: Ok, thank you for your response.

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