You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Emma Thompson. I just need your help in changing my existing reservation details.

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Emma, there is no active reservation on your name in our data base.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.