You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me in booking flight ticket from Washington, DCA to reach IAD?

ASSISTANT: May I know your trip dates?

USER: My journey dates are from Sept 21 to Sept 23.

ASSISTANT: Do you prefer any specifications?

USER: Usually I prefer direct flight, If it is not there please proceed with single stopover flight.

ASSISTANT: We found a direct flight in Frontier airlines with the fare 100.

USER: Sure, you can proceed for booking.

ASSISTANT: On whose name I should book?

USER: My name is Kevin Martin.

ASSISTANT: Your booking is done.

USER: Thanks for your help.

ASSISTANT: Thank you.