You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kenneth Williams.

ASSISTANT: How can I aid you today?

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: Sorry to say this, no reservation found under your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.