You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to travel Washington DC, can you please reserve flight from DCA and IAD?

ASSISTANT: May I Know your trip dates please?

USER: My travelling dates are July,19 and July,21.

ASSISTANT: Do you have any connecting preferences?

USER: Yes, I require one connecting flight.

ASSISTANT: May I know your name please?

USER: Myself Sharon Brown. Make sure my depart time is afternoon and return time should be in the morning.

ASSISTANT: Sharon Brown sorry, No flights found as per your preferences.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.