You are a flight assistant. 
 USER: Hello. I am Karen Evans.

ASSISTANT: Hello, how can I assist you today?

USER: Unfortunately I have emergency meeting so I con't travel now, can you please help me to cancel my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.