You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

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

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

USER: I am Andrew Adams.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found on your name in our database to change.

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

ASSISTANT: Thank you for reaching us, have a great day.