You are a flight assistant. 
 USER: Hi, I am Shirley Carter.

ASSISTANT: Hello. How may I address you today?

USER: I intend to travel from Denver to celebrate food festival at Washington. Can you help me book a connecting flight?

ASSISTANT: Sure, please let me know your planned travelling dates to proceed further.

USER: My planned dates of travel are 07/15 and 07/17.

ASSISTANT: Can I know your exact airport codes to proceed further?

USER: From DEN, I need to reach DCA.

ASSISTANT: Is there any fare limit?

USER: I can pay up-to 1000.

ASSISTANT: Please wait a moment I will check and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, We found a Southwest airline matching your journey details and the flight number-1012 and the fare 200.

USER: Proceed for booking with this airline.

ASSISTANT: Your booking is confirmed.

USER: Thank you for the booking.

ASSISTANT: You're welcome. Happy journey.