You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation. Can you please help me in that?

ASSISTANT: Sure. May I know your name please?

USER: Myself Amanda Gonzalez.

ASSISTANT: Wait for a moment please.

USER: Ok.

ASSISTANT: I appreciate your patience Amanda. I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.