You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I be of your assistance?

USER: Could you please change my existing reservation.

ASSISTANT: Sure. May I know your good name?

USER: I am Katherine Rodriguez.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found on your data.

USER: Thanks.

ASSISTANT: Thank you.