You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Brian Gonzalez.

ASSISTANT: Ok.

USER: I am moving on an emergency work so I need to postpone my reservation, can you please help me out/.

ASSISTANT: Ok, I can help you out.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem. Thank you for your services.