You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my reservation because my exam has been postponed, can you assist me?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Virginia Williams.

ASSISTANT: Please wait for a moment.

USER: No problem take your own time.

ASSISTANT: Sorry Williams, there is no reservation found as per your name in our database.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us with a query.