You are a flight assistant. 
 USER: Hello, Robert Taylor here.

ASSISTANT: Hello. What kind of help are you expecting from us?

USER: Due to my art exhibition postponed, can you change my reservation?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry Taylor, I couldn't find any reservation on your name.

USER: It's fine. Thank you for searching.

ASSISTANT: You are welcome.