You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation which I have done already a month ago, as my exams got postponed. Can you please help me out with it?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Yes, my good name is Benjamin Wright.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry Wright, There is no reservation found as per your name.

USER: Ok, no problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us with a query.