You are a flight assistant. 
 USER: Hello, I am Benjamin Davis.

ASSISTANT: Hello. How can I aid you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No problem, thank you for the information.

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