You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what services are you seeking from us?

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

ASSISTANT: Sure, I am gleeful to help you. May I know your good name please?

USER: I am Mary Wilson.

ASSISTANT: Ok, give me a moment please.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.