You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: My name is Brandon Wilson.

ASSISTANT: How may I aid you today?

USER: I reserved a ticket last week to New York to attend workshop, but I want to change my reservation because my workshop is postponed. Can you help me?

ASSISTANT: I would be happy to help you with that.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name Wilson.

USER: That's ok, I think my brother has changed the details, anyways thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.