You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome, have a nice day.