You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

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

ASSISTANT: Ok, I am here to help you with that. May I know your good name?

USER: I am Linda Scott.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

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

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

ASSISTANT: Thank you for reaching us.