You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you today?

USER: I am David Thomas and I want to book a flight to attend automobile expo in 10/18 from 10/20.

ASSISTANT: Sure, may I know your journey points?

USER: My airport codesare from  IL-ORD to WA-SEA.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a matching airline Southwest with flight number-1001 and the price 200.

USER: You can proceed with this airline.

ASSISTANT: Your ticket is booked.

USER: Thanks for your service.

ASSISTANT: Thanks for contacting us.