You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I have to attend my friend marriage reception in Denver, CO - DEN. So. please help me to book a flight ticket under a fare of 500?

ASSISTANT: Sure, I am here to help you. May I know your starting point?

USER: My starting point is Washington DC - IAD.

ASSISTANT: Please share me your travelling dates?

USER: My travelling dates are as follows, on 01/11 I want to start and on 01/13 I have to return.

ASSISTANT: Do you want any lay by in between your travel?

USER: Obviously, I need a halt in between.

ASSISTANT: May I know your name please?

USER: Katherine Davis is my name.

ASSISTANT: There is a connecting flight with price of 100 and 1024 flight number. Shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your booking has been confirmed with Frontier airline.

USER: Thanks for the help in booking.

ASSISTANT: Thanks for your approach.