You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you?

USER: Last week I have booked a ticket to attend a meeting at Boston but now I have got a mail that the meeting is going to be help at Charlotte, can you please change my existing reservation?

ASSISTANT: Sure, May I know your name?

USER: Sure, I am Brandon Roberts.

ASSISTANT: Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, may be it was not reserved properly. Thank you for your information.

ASSISTANT: Thank you, Have a great day.