You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Myself Steven Phillips. I have to attend a  business meeting in Boston, can you please book a flight ticket from DCA airport?

ASSISTANT: Sure, I will help you. Could you please provide your preferable dates that you want to travel?

USER: Thanks, my departure date is 08/03 and please book my return ticket also on 08/05.

ASSISTANT: Ok, may I know your destination airport code to proceed further?

USER: Sure, my destination airport is BOS.

ASSISTANT: Please wait a moment to check the availability of flights.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no flights moving to your travelling with your requested dates of travelling.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you for approaching us, have a great day.