You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I lend a hand to?

USER: I want to attend a Marriage in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you for this. Could you please share me your airport codes?

USER: My airport codes are ATL and IAD.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I want to departure on afternoon.

ASSISTANT: When would you like to travel?

USER: My travelling dates are Jan 25 and Jan 27.

ASSISTANT: Do you have any other criteria?

USER: I would prefer single connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Christopher Lewis.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you very much for contacting our agency.