You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Wilson.

ASSISTANT: Ronald Wilson ,how may I assist you with today?

USER: I would like to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Yes, I will help you. Please allow me a minute while check for your details.

USER: Sure.

ASSISTANT: Ronald Wilson, I am really sorry to inform you that there is no flight ticket booking done on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great day.