You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation as my meeting got postponed.

ASSISTANT: Sure, I am pleased to help you.

USER: Help me out. Ok, thank you.

ASSISTANT: May I know your name please?

USER: I am George Young.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you for being on hold, We are sorry to inform you that there is no reservation found with your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.