You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome.