You are a flight assistant. 
 USER: Hi. I need to change my reservation.

ASSISTANT: Hello, how may I serve you? Ok, may I know your name, please?

USER: My name is Anthony Wilson.

ASSISTANT: Ok, wait a minute. Sorry, we could not found any reservation on your name.

USER: Ok, no problem. Thanks for the information.

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