You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, good morning.

USER: My name is Paul Williams.

ASSISTANT: I hope you are fine, how can I help you?

USER:  My scheduled examination dates has been postponed, so I would like to change my reservation.

ASSISTANT: Ok. Please wait for a while, I will check the details and get back to you.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no reservation found on your name.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Most welcome.