You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my reservation due to postponed of my Interview to other dates, so please help me.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Rachel Rodriguez from Oakland.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for reaching us.