You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

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

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: May I know your good name? Please wait for a moment.

USER: I am Dennis Robinson. Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: That's ok, thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.