You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to modify my reservation which I have done my reservation on my name Susan Mitchell.

ASSISTANT: Sure, may I know your name for checking purpose?

USER: My name is Susan Mitchell.

ASSISTANT: There is no reservation found on the name which you have mentioned for checking. Thank you for reaching us, have a nice day.

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

ASSISTANT: You are welcome.