You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Ok.

USER: Can you please change my existing reservation?

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

USER: Sure, I am Stephanie Martinez.

ASSISTANT: Please, stay online. I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: Thank you for your valuable time. We are sorry to inform you that, no reservation was found on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for reaching us, have a good day.