You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Brown.

ASSISTANT: How can I help you?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: There is no reservation on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.