You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, can I know your name please?

USER: My reservation was done under the name Ronald Johnson.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: That's ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Anyways, thank you for the information.