You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to do some changes in my existing reservation due to some issue. Can you help in this?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Myself Katherine Harris.

ASSISTANT: Harris, in my database I did not found any reservation with your name.

USER: That's ok, no issue.

ASSISTANT: Anything else to help you.

USER: No, thank you for your information.

ASSISTANT: My pleasure, have a nice day.