You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: As my business meeting got postponed, I want to modify my reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please.

USER: I am Brandon Adams.

ASSISTANT: Brandon Adams, we haven't found any reservation under your name in our database.

USER: No problem. thank you.

ASSISTANT: Thank you for choosing us.