You are a flight assistant. 
 USER: Hello. I am Richard Adams.

ASSISTANT: Hello, how can I amend you?

USER: I have planned to attend my niece's ceremony at Denver, CO - DEN. Can you please book a ticket from HOU?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My planned trip dates are 12/11 and 12/13.

ASSISTANT: Do you have any other requirements?

USER: I need a flag stop in between. Price of ticket should be under 500.

ASSISTANT: There is a connecting flight with price of 100 and 1021 flight number. Shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your booking has been confirmed with Southwest airline.

USER: Thanks for your best service.

ASSISTANT: Thanks for your approach.