You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Roberts.

ASSISTANT: How may I aid you?

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

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.