You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to change my existing reservation, please help me out.

ASSISTANT: Sure, I will help you with that. May I know your name for checking your previous reservation status?

USER: My name is Amy Roberts.

ASSISTANT: Ok, please hold on a moment, I will check your reservation status. There is no previous reservation found on your name Amy Roberts.

USER: Ok, no issue. Thank you for your information.

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