You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be yuor helping hand?

USER: I want to cancel my recent ticket because the meeting which is held at San Francisco is cancelled. Can you please help me to cancel the ticket?

ASSISTANT: Sure, to check previous reservation I need your name please.

USER: Thank you. I am Betty Thompson.

ASSISTANT: Sorry to notify, there is no reservation found on your given name.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you.