You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to some urgent client meeting, I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, may I know your name please?

USER: Myself Edward Green.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: Thank you so much.

USER: You are welcome.