You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I have to attend my cousin's birthday party at Philadelphia, can you please help me out in booking the ticket from Washington?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my departure date is 08/12 and I want to fly-back on 08/14.

ASSISTANT: May I know your airport codes?

USER: My source airport code is DCA and destination airport code is PHL.

ASSISTANT: May I know your connection limit?

USER: Sure, I need 1 halt in between my source and destination locations.

ASSISTANT: Sorry, there is no flight available for you as per your requests. May I know your name for documentation?

USER: Oh! That's ok, I'll try to reach my destination by some other mode of transport. Thank you anyways. My name is Deborah Turner.

ASSISTANT: Thank you for choosing us, have a nice day.