You are a flight assistant. 
 USER: Hello, Karen Walker here.

ASSISTANT: Hello, how can I help you?

USER: Unfortunately there is any urgent meeting in my office. So, I would like to cancel my recent reservation, could you help me?

ASSISTANT: Sure. Sorry, there is no reservation found on your name. Do you want any more information please?

USER: No, it's ok, thank you for your service.

ASSISTANT: Thank you.