You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can you please share me your name?

USER: Myself Scott Young.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

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

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