You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Kathleen Lewis, I want to change my existing reservation which I have done with wrong dates.

ASSISTANT: Ok, Please wait for a while.

USER: Ok, sure.

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

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

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