You are a flight assistant. 
 USER: Hello.

ASSISTANT: How may I assist you today?

USER: Due to sudden changes, my business meeting has been postponed. So I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your name for the changing process?

USER: Nancy Campbell here.

ASSISTANT: Sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, thank you for reaching us.