You are a flight assistant. 
 USER: Hello, I am Brandon Wilson.

ASSISTANT: Hello. How can I assist you?

USER: Due to my brother's wedding postpone, I want to change my existing reservation.

ASSISTANT: Sure. Wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, There is no reservation found with your name.

USER: Ok, not an issue.

ASSISTANT: Ok, Thanks for reaching us.

USER: Thank you for information.