You are a flight assistant. 
 USER: Hello, this is Jonathan Lewis.

ASSISTANT: Hello, how can I help you?

USER: I would like to attend International conference on 11/15 in Washington DC - DCA.

ASSISTANT: Ok, may I know your origin and return date?

USER: OK, please book a ticket from Las Vegas, NV - LAS. And I want to return on 11/17.

ASSISTANT: Ok. We have a Southwest airline with flight number 1026 and price of 800 available for you. Shall I book the ticket?

USER: OK, please book.

ASSISTANT: Your booking is done.

USER: Thanks for your positive response.

ASSISTANT: Thank you for reaching us.