You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be of your assistance?

USER: Please change my reservation which is with the name Cynthia Young due to post pone of my sister's wedding.

ASSISTANT: Sure, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: That's fine, thank you for informing me.

ASSISTANT: Thank you for availing us.