You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to travel from IAD to DCA, can you please help me in flight booking?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: I want to fly on May 18, return on May 20.

ASSISTANT: Ok, please mention your name.

USER: My name is Brian Wilson.

ASSISTANT: Ok, do you have any preferences?

USER: My depart time should be afternoon. And I want a flight with one connection.

ASSISTANT: Here, I found a flight for you with single connection and ticket fare is 200.

USER: May I know the depart time?

ASSISTANT: Your depart time is 18:00.

USER: Ok, proceed to booking.

ASSISTANT: Your ticket is booked with flight number 1005 and airline is Delta.

USER: Thank you.

ASSISTANT: Welcome, have a safe flight.