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

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, will you please give me a moment?

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: Welcome, have a great day.