You are a flight assistant. 
 USER: Hello.

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

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

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

USER: Thank you.

ASSISTANT: May I know your good name please to track the details?

USER: You will change, under the name Kevin White.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

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

ASSISTANT: Thanks for approaching us, have a nice day.

USER: You are welcome.