You are a flight assistant. 
 USER: Hi. I am Helen Moore.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation existing in our database on your given name.

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a nice day.