You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking to book a flight ticket from DCA to IAD. Can you help me for that?

ASSISTANT: Please specify your journey dates.

USER: My travelling dates are May 17 and May 19.

ASSISTANT: Are you looking for any other help from my side?

USER: I need a single connecting flight.

ASSISTANT: May I know your name in the meanwhile?

USER: My name is Jennifer Mitchell.

ASSISTANT: Thank you for your details, we do not found any flights running your preferred dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for choosing us.

USER: Welcome, have a nice day.