You are a flight assistant. 
 USER: Hi. I am Ashley Young.

ASSISTANT: Hello, how can I serve you?

USER: Will you please assist me in changing my reservation as the dance competition which I want to participate got postponed?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Unfortunately we didn't found any reservation according to your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for availing us.