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

ASSISTANT: Hello, how may I serve you?

USER: I want to cancel my reservation, can you please help me that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

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

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

ASSISTANT: Thank you for opting us.