You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Wilson.

ASSISTANT: Melissa Wilson, how can I assist you for the day?

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

ASSISTANT: Sure, I am here to help you with that changing.

USER: Thank you.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry to tell you that, there is no active reservation found with your name to change it.

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

ASSISTANT: Thank you for reaching us, have a great day.