You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a flight ticket from Washington DC-DCA to Washington DC-IAD.

ASSISTANT: Can I have your travelling dates?

USER: Sure. My planned dates should be on 02/14 to 02/16.

ASSISTANT: Ok, Is there any further requirement?

USER: Please ensure the price limit is 500.

ASSISTANT: Ok, give me a second, I will check and revert you.

USER: Sure.

ASSISTANT: There is a flight with frontier airline, flight number is 1017 with the price 100. Can I proceed with the booking?

USER: You can proceed with the booking.

ASSISTANT: May I know your good name please?

USER: Ya, Mary Hernandez here.

ASSISTANT: Thank you.

USER: Thank you, have a nice day.

ASSISTANT: Your booking is confirmed, have a safe journey.