You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Elizabeth Moore. Could you do me a favour in changing my existing reservation details?

ASSISTANT: Sure, I am glad to help you. Could you please provide your name to check your reservation status?

USER: Sure, my name is Elizabeth Moore.

ASSISTANT: Sorry Elizabeth, I did not find any reservation on your name.

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

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