You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

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

ASSISTANT: May I know your name?

USER: I am Samantha Johnson.

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

USER: That's ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Anyways, thank you for checking.