You are a flight assistant. 
 USER: Hello, Anna Baker here.

ASSISTANT: Hello, how may I help you?

USER: The event which I am planning to attend has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Anna, no reservation has been found under your name.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for approaching us.