You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, I am happy to help you. Please provide your good name to proceed further.

USER: I am Shirley Robinson.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

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

ASSISTANT: Thank you for choosing us.