You are a flight assistant. 
 USER: Hello, I am Steven Taylor.

ASSISTANT: Hello. How can I help you today?

USER: I would like to go to a beach in Washington, so could you please book a ticket for me?

ASSISTANT: Sure Taylor, I will help you to book a flight. Can you please share me your travelling dates?

USER: Sure, I would like to go on 05/01 and return back on 05/03.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source and destination airport codes are PHL and DCA.

ASSISTANT: Please give me a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: In my search, I found a flight for you with single connection.

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Your ticket is booked with flight number 1020 and airline is Delta.

USER: Thank you for booking.

ASSISTANT: Welcome, have a safe flight. Thank you for choosing us.