You are a flight assistant. 
 USER: Hello. I am Jack Brown.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit Death Valley Adventure at Las Vegas, can you please book me a ticket from Washington?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are from 12/19 and 12/21.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from IAD to LAS.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a halt.

ASSISTANT: We are glad to say that, we found an airline: JetBlue, flight number: 1016 and price is 200.

USER: Ok, please book this ticket.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.