You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates are Mar 26 to Mar 28.

ASSISTANT: May I know your location airport codes?

USER: My airport code is DCA.

ASSISTANT: Here is a direct flight with airfare about 100 in Delta airlines, can I proceed with it?

USER: Ok, please proceed to book.

ASSISTANT: Your ticket has been booked with 1006 flight.

USER: Thanks for your booking.

ASSISTANT: Thank you.