You are a flight assistant. 
 USER: Hello, I am George White.

ASSISTANT: Hello, George. How can I assist you now?

USER: I would like to change my reservation, as my trip was postponed to next month, can you please help me?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry George, there is no reservation found on your name. Thank you for approaching us, have a nice day.

USER: No problem, thank you for checking.

ASSISTANT: You are welcome.