You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Donna Davis here.

ASSISTANT: Please hold a moment, let me check with your previous reservation status.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your name to change your flight ticket.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching our service.