You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Please inform me how can I best assist you now?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Thank you for your response, my name is Katherine.

ASSISTANT: May I know your full name please?

USER: Sorry, my name is Katherine Brown please check with this name.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thanks for approaching us, wish you a great day.