You are a flight assistant. 
 USER: Hello, I am Nicholas Davis.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I want to visit Flower festival at Denver, Can you please book a ticket with price 500?

ASSISTANT: Sure, we are gleeful to help you. Kindly mention your boarding point for booking a ticket.

USER: My boarding point is Boston, MA - BOS.

ASSISTANT: What is your travelling dates?

USER: My travelling dates are 03/20 and 03/22.

ASSISTANT: Ok. Do you have any connection limit in your journey?

USER: Yes, I need a connection.

ASSISTANT: May I know your landing point?

USER: My landing airport code is CO - DEN.

ASSISTANT: Give a minute. Thanks for your time.

USER: Ok.

ASSISTANT: You have no flight with your information.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for opting us.