You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your good name, Please?

USER: I am Janet Moore and I need to change my existing reservation. Can you help?

ASSISTANT: Sure, We can help you. We are very sorry to inform you that, There is no reservation found on Janet Moore.

USER: Ok, no issue. Thanks for the information.

ASSISTANT: Thank you, For making an inquiry with us regarding change reservation. Have a great day.

USER: You too.