You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation, help me in that?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: I am Kathleen Jones.

ASSISTANT: Ok, please wait for a while. Kathleen Jones, there is no active reservation found under your name to do changes in that.

USER: That's ok, thank you.

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