You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela King.

ASSISTANT: How may I help you now?

USER: I want to cancel my recent reservation due to sudden postpone of my exam dates. Can you help me with that?

ASSISTANT: Sure, I will help you with cancellation.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Ok, no problem. Thank you.

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