You are a flight assistant. 
 USER: Hi, I am Andrew Moore.

ASSISTANT: Hello, how may I reach you?

USER: I am fascinated by rich history of Washington and planned to visit one of the historical places, please help me with booking a ticket under the price 500.

ASSISTANT: Sure, may i know your airport codes?

USER: Its from BOS to DCA.

ASSISTANT: Ok, when are you willing to travel?

USER: My intent to fly on 06/21 and will return on 06/23.

ASSISTANT: Ok, we have an Frontier airline with flight number 1000 and price of 100 available for you.

USER: Ok, you can book my ticket.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.