You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me in changing my reservation as my meeting got postponed?

ASSISTANT: Sure, wait a while I will the status.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: May I know your name.

USER: I am Brian Lopez.

ASSISTANT: Thank you for choosing us.

USER: Thank you.