You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Samantha Lee. I would like to change my existing flight ticket. Could you please help me out?

ASSISTANT: Sure, please hold on for a moment, let me check.

USER: Sure, please take your time.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you, have a good day.