You are a flight assistant. 
 USER: Hello, I am Ashley Johnson.

ASSISTANT: Hello, how can I aid you today?

USER: As the conference which I want to attend got postponed.Can you please change my reservation?

ASSISTANT: Ok. Please hold on for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, not a problem.Thanks for the information.

ASSISTANT: Thank you have a good day.