You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Anthony Phillips here. I would like to change my recent reservation because my brother marriage was postponed.

ASSISTANT: Sure, please hold on for a moment.

USER: Sure.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you, have a good day.