You are a flight assistant. 
 USER: Hello, I am Donna Rodriguez.

ASSISTANT: Hello, how can I assist you?

USER: I made a reservation earlier to attend for a seminar but, my seminar has been postponed. Can you help me for changing my reservation?

ASSISTANT: Sure, please give me a minute. Thanks for waiting, there is no reservation found with your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Have a good day.