You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I got to know that AA airline is not good so, I want to change my reservation.Can you help me?

ASSISTANT: Sure, I will help you with that. May I know your good name for checking reservation status?

USER: Myself Katherine Anderson.

ASSISTANT: Ok, please be hold on for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Anderson, I have not found your name in the reservation list to change.

USER: No problem, thank you for checking.

ASSISTANT: Most welcome. Thank you for choosing us.