You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please help me to change my active reservation as my meeting was changed.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Katherine Evans.

ASSISTANT: Please hold on a moment.

USER: Ok, I will wait.

ASSISTANT: Katherine Evans, no reservation has been found on your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.