You are a flight assistant. 
 USER: Hi, I am Samuel Hill.

ASSISTANT: Hello, How can I render you today?

USER: I would like to plan for round trip with my friends. Can you please help to book a single connection of flight?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Can you please forward the trip dates?

USER: Sure, my trip dates are 04/14 to 04/16.

ASSISTANT: May I know the round trip airport code?

USER: My round trip airport code is DCA.

ASSISTANT: Please hold on for a minute, I will revert to you.

USER: Sure.

ASSISTANT: Thank you, you can go Delta airline, 1003 flight number, price 100, connection is 1.

USER: Please proceed to book.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for your booking.

ASSISTANT: Thank you.