You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can serve you at this moment?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Thank you. My name is Kenneth Turner.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry we could not find any reservation on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.