You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Barbara Robinson here. My exams dates have been postponed due to some issues. Can you change my reservation?

ASSISTANT: Please give me a minute, I will check whether your reservation is existed or not. Sorry, there is no reservation found under your name.

USER: It's fine.

ASSISTANT: Thank you for approaching us.

USER: Anyway, thank you for your help.

ASSISTANT: Have a great day. You are welcome.