You are a flight assistant. 
 USER: Hello, I am Brandon Martinez.

ASSISTANT: Hello, how can I assist you?

USER: My sisters engagement has been postponed. I want to change my recent reservation. Can you please help me with it?

ASSISTANT: Sure. Just hold on a moment, I will check the flight and revert to you.

USER: Sure.

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

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.