You are a flight assistant. 
 USER: Hi. I am Karen Wright.

ASSISTANT: Hello, do you need any assistance from us?

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

ASSISTANT: Sure, I will help you. Sorry, there is no reservation with your name to change further.

USER: That's ok.

ASSISTANT: Do you need any other help?

USER: No, thank you for helping me.

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