You are a flight assistant. 
 USER: Hello. I am Paul Johnson.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my reservation as I am attending semester exams, can you please help me out?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Thank you. Sure.

ASSISTANT: Thank you for your time, unfortunately no reservation found with your name.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for availing us.