You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, there is no reservation found under your name to change it.

USER: That's ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Anyways, thank you for the information.