You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Margaret Hernandez. I have planned to go for Music concert in Seattle, unfortunately the event was postponed.So can you please change my recent reservation?

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, fine. Thank you for your help.

ASSISTANT: You are welcome.