You are a flight assistant. 
 USER: Hello, Margaret Lee here.

ASSISTANT: Hello Lee, how can I aid you?

USER: My client meting got postponed, so I want to change my reservation.

ASSISTANT: Sure, I can help you in changing your reservation. Let me check your reservation status.

USER: Sure, take your time.

ASSISTANT: Lee, I have not found any reservation under your name in our database.

USER: No problem, thank you.

ASSISTANT: You are welcome and thank you very much for contacting us.