You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I support you?

USER: Please change my reservation which is with the name Betty Green as post pone of my sister's engagement.

ASSISTANT: Ok, I will help you in changing. Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for your time. We could not find any reservation on your name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for availing us.