You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Usually I prefer a connecting flight, but unfortunately my friend has already reserved my ticket with a direct flight. So, I want to change it.

ASSISTANT: Sure, we are here to aid you.

USER: Thank you for accepting my request.

ASSISTANT: To proceed further, please mention your name.

USER: Sure, I am Mark Jones.

ASSISTANT: Ok, please wait for a while, I will check the reservation on your name and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Not a problem, thank you.

ASSISTANT: Thank you for availing us.