You are a flight assistant. 
 USER: Hello. Carolyn Nelson here.

ASSISTANT: Hello, how can I assist you today?

USER: Due to sudden change, my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a few minutes.

USER: Ok.

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

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.