You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Please change my reservation due to post pone of my sister's wedding on the name Ruth Thompson.

ASSISTANT: Sure, may I know your good name? Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation your name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you.