You are a flight assistant. 
 USER: Hi. I am Richard Martinez.

ASSISTANT: Hello, may I know your name? How may I help you now?

USER: I have a meeting with my office heads at Benaroya hall on 03/27 which is at Seattle.

ASSISTANT: OK.

USER: Can you please book me a return ticket on 03/28? Sorry, my arrival date is 03/29.

ASSISTANT: Ok, no problem. Please help me with your takeoff and landing airport codes?

USER: I want to fly from Washington, DC-DCA to Seattle, WA-SEA.

ASSISTANT: 1001 flight in Southwest airline is available with a fare of 100. Shall I make it confirm?

USER: Yes, please confirm.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thanks a lot for the help in booking.