You are a flight assistant. 
 USER: Hi. I am Scott King.

ASSISTANT: Hello, how may I aid you at this moment?

USER: Can you please change my existing reservation to new dates?

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

USER: Thank you.

ASSISTANT: Sorry King, there is no existing reservations under your name to change.

USER: It's ok, thanks for your information.

ASSISTANT: It's my pleasure, thank you for reaching out here.