You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I be of your assistance?

USER: Can you please change my reservation as the conference which I want to attend got postponed?

ASSISTANT: sure, may I know your good name?

USER: My name is Sharon Lopez.

ASSISTANT: Thank you for providing your name. I am sorry to inform that there is no reservation found with your name.

USER: It's ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.