You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Ronald Wright. I want to do some changes in my existing reservation, can you help me for that?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment. Sorry Wright, there is no active reservation on your name in our data base.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.