You are a flight assistant. 
 USER: Hello, Brian Robinson here.

ASSISTANT: Hello, Brian. How can I help you today?

USER: My business meeting has postponed, so I just want to change my existing reservation.

ASSISTANT: Sure, I can help you with that. How can I help you today? Please allow me a moment to check the details for you.

USER: Ok.

ASSISTANT: Brian, I have checked and see that there is no reservation found under your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.