You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My scheduled examination dates has been postponed, could you please help me with changing my recent reservation?

ASSISTANT: Sure, I will help you with the change of flight reservation. May I know your name please?

USER: My reservation was done under the name Joshua Williams.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: That's ok, not an issue.

ASSISTANT: Thank you.

USER: Anyways, thank you for the information.