You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I'm Gregory Davis. I am planning to attend music concert at Washington, can you please help me with booking a flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I would like to take off on 03/02 and return back on 03/04.

ASSISTANT: May I know your journey airport codes?

USER: My source airport code is DEN and the destination airport code is IAD.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Ok, but please make sure that the price limit does not exceed 500.

ASSISTANT: Here is a flight with ticket fare 100 in UA airlines with connection 1, would you like me to proceed with the booking?

USER: Yes, please proceed with the booking.

ASSISTANT: Your booking is confirmed with flight number 1019.

USER: I appreciate your help, thank you.

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

USER: You are welcome.