You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, please wait for a couple of minutes, may I know your name?

USER: My reservation was done under the name Nicholas Smith.

ASSISTANT: Sorry Nicholas Smith, no reservation done on your name previously.

USER: That's ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Anyways, thank you for the information.