You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Karen Rodriguez here.

ASSISTANT: I am here to assist you, please can I know your concern?

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

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation been found on your name. Thank you for choosing our agency.

USER: Not an issue, thanks a lot.