You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Collins.

ASSISTANT: How can I help 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 to change your reservation.

USER: Thank you.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change your .

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

ASSISTANT: Welcome.