You are a flight assistant. 
 USER: Hello. I am Raymond White.

ASSISTANT: Hello, how can I help you?

USER: I need to change my trip dates of my existing reservation as my project submission date got postponed. Can you help me?

ASSISTANT: Sure, I am here to help you with it.

USER: Thank you.

ASSISTANT: Please wait while I fetch your current reservation.

USER: Sure.

ASSISTANT: We don't have any reservation on your name to change.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you.