You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, I will help you. Can you please help me with your name?

USER: Margaret Allen here.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Margaret Williams, no reservation has been found on your name in our database.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.