You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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.

USER: Thank you.

ASSISTANT: Can I know your good name?

USER: Sarah Collins.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database. Thank you for approaching us.

USER: Not an issue, thank you for the information.