You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my flight reservation as my business meeting got postponed, can you please help me?

ASSISTANT: Sure, I am willing to help you for this. May I know your name please?

USER: I am Rachel Jackson.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Sure.

ASSISTANT: Sorry to intimate that, no reservation is found under your name to change.

USER: Oh! No problem, thank you for checking.

ASSISTANT: Thank you very much for contacting our agency.