You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I aid you at this moment?

USER: Please, change my existing reservation as my venue for art gallery expo has been changed.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Could you please help me with your name?

USER: Reservation is done with my name Samuel Edwards.

ASSISTANT: Sorry Samuel Edwards, we didn't find any reservation on your name in our reservation list.

USER: Ok, not a problem.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for help.