You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Ruth King. I want to book a flight ticket with a single connection, so please help me in booking a flight ticket.

ASSISTANT: Sure, can you please share your travelling dates?

USER: My departure is 06/03 and return date on 06/05.

ASSISTANT: May I know your airport codes?

USER: I am planning to visit National Gallery Art in DC - IAD and my source from PA - PHL.

ASSISTANT: Do you have any specifications?

USER: My price limit is 500.

ASSISTANT: Please wait for a while, I will check the availability of flights.

USER: Sure.

ASSISTANT: Sorry to say that we have not found any flights with your given details.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thanks for choosing us. Have a good day.

USER: Thank you.

ASSISTANT: Thank you.