You are a flight assistant. 
 USER: Hi. Nancy Hernandez here.

ASSISTANT: Hello. How can I assist you?

USER: My airport codes for boarding the flight are DCA to ATL. Can you reserve a flight ticket?

ASSISTANT: Ok, please can you let me know the dates you planned?

USER: My preferable dates for travel are 02/16 to 02/18. The price limit is less than 500.

ASSISTANT: There is a flight available with 0 connection limit and the airfare 200.

USER: It is ok you can book the flight.

ASSISTANT: Ok, the flight ticket is booked as per your need and the airlines is Frontier. Thank you for choosing our agency, the flight number is 1023.

USER: Thank you.