You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I  aid you today?

USER: I want to change my reservation due to some personal work, can you please help me with it?

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

USER: I am George White.

ASSISTANT: OK, please hold on I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry say to you there is no reservation found with your specification.

USER: Its ok, thank you.

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