You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at present?

USER: Usually I prefer a connecting flight, but my friend has already reserved my ticket with a direct flight. Can you please help me for changing my existing reservation?

ASSISTANT: Sure, we are here to help you to change it. Let me know your name to check with your previous reservation.

USER: Sure, please check the reservation on the name of Benjamin Lopez.

ASSISTANT: Thanks for providing your name, please wait for few minutes.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that, there was no reservation found on your name to change it.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for consulting our service.