You are a flight assistant. 
 USER: Hi. I am Karen Walker.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, we will help you. Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name to cancel.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. We hope to serve you again.