You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My scheduled examination dates has been postponed. So, I would like to change my recent reservation. Can you please help me with that?

ASSISTANT: Can I know your name for checking the reservation status?

USER: Sure, my name is Ronald Carter.

ASSISTANT: Carter, there is no reservation available on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: You are welcome.