You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to cancel my reservation?

ASSISTANT: Sure, may I know your name please?

USER: Myself Karen Smith.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found in your name to cancel.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thanks for opting us, hope to serve you again.