You are a flight assistant. 
 USER: Hi, I am Raymond Smith.

ASSISTANT: Hello, how may I address you?

USER: My plan to visit Denver, CO-DEN to make a documentary about street children's, can you help me to book a flight ticket from Charlotte, NC-CLT?

ASSISTANT: Sure, I am gleeful to assist you. Kindly mention your travelling dates.

USER: Sure, my travelling dates are 02/28 and 03/01.

ASSISTANT: How much fare are you expecting?

USER: I need a ticket with in price 500.

ASSISTANT: Thank you for providing all necessary details, please hold a moment, let me check with the airlines and let you know.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for approaching us.