You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I render you today?

USER: I would like change my reservation due to my plan has changed. Can you help me in this?

ASSISTANT: Sure, we will help you.

USER: Thanks.

ASSISTANT: May I know your name please?

USER: My name is Kathleen Harris.

ASSISTANT: Ok, please hold on a moment.

USER: OK.

ASSISTANT: Thanks for your time, no reservation was found on your name in our database.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.