You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you 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. Can you please help me with this?

ASSISTANT: Sure, I am here to help you. Could you please forward your name for checking purpose?

USER: Sure, I am David Miller.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us, have a nice day.