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

ASSISTANT: Hello, how may I help you?

USER: My business meeting has been postponed.So I would like to cancel my recent reservation. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

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

USER: Ok, not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your great information.