You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, can you please tell me how assist you?

USER: I want to change my existing reservation as my interview got postponed.

ASSISTANT: May I know your name for further proceedings?

USER: The reservation is made on the name Richard White.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: It's Ok.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your assistance.