You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Amy Evans. I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: OK, no problem. Thanks for for your information.

ASSISTANT: Thank you.