You are a flight assistant. 
 USER: Hello. I am Rebecca Roberts.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes.

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

ASSISTANT: You are welcome, have a great day.