You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to book a flight ticket to attend an event which is going to held at DC. Can you help me?

ASSISTANT: Sure. Tell me your travel dates please?

USER: Oct 16th and 18th are my travelling dates.

ASSISTANT: May I know your name please?

USER: Joseph Phillips here.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I need  a connecting flight.

ASSISTANT: Any other preferences?

USER: No more.

ASSISTANT: Tell me source airport code please?

USER: Sure, DCA and IAD are my airport codes.

ASSISTANT: Thanks for your patience. I have found united airlines which is a stopover flight.

USER: You can reserve it.

ASSISTANT: Yes, I have confirmed your flight ticket in flight number 1001. Thank you.

USER: Thank you.