You are a flight assistant. 
 USER: Hello, I am Helen Jackson.

ASSISTANT: Hello, how may I assist you?

USER: I need a ticket in direct flight to Washington. Can you book it?

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

USER: I am planning to start on 06/04 and return back on 06/06.

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

USER: Search for the flights flying from LAX to IAD.

ASSISTANT: Ok, hold on for a moment. Let me check the flight for you.

USER: Make sure that price not exceeding 200.

ASSISTANT: I found a flight for you with AA airline and it costs you 500. Shall I proceed?

USER: Yes.

ASSISTANT: Your ticket has been booked with 1004 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.