You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you aid me to change?

ASSISTANT: Sure, we are here to help you. To proceed for changing, we need your name.

USER: Sure, my name is Ashley Lewis.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any reservation on your name.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.