You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you with that. Please provide me your name to check your previous reservation is active or not.

USER: Kevin Brown here.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found on your name in our database.

USER: No problem, Thanks for the information.

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