You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi. How may help you?

USER: Rebecca Clark here. I want to cancel my recent reservation due to my best friend health issue, hope your helping me.

ASSISTANT: Sure, just a second please.

USER: Sure.

ASSISTANT: No reservation found on your name Mr.Rebecca Clark.

USER: Ok, thank you for your information.

ASSISTANT: Thank you.