You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I am Karen Smith. Can you cancel my recent reservation?

ASSISTANT: Sure, We are here to assist you.

USER: Thanks.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to cancel it.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for opting us.