You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to change my existing reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Kenneth Anderson.

ASSISTANT: There is no reservation found under your name to change.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.