You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I am Margaret Edwards. I would like to change my existing reservation due to postpone of my event.

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: Sorry we couldn't find any reservation on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.