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

ASSISTANT: Hello, How can I assist you today?

USER:  I want to book a flight ticket to attend international conference about social issues at Washington on 08/15 and I intend to return on 08/17, can you help me in booking?

ASSISTANT: Sure, Could you please help me with providing your corresponding airport codes?

USER: My boarding point is Philadelphia, PA-PHL and my destination is Washington DC-DCA.

ASSISTANT: Do you require any stopovers in your journey?

USER: I prefer one connection.

ASSISTANT: How much you can spend for airfare?

USER: I need the ticket within the fare limit 200.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for availing us.