You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Rodriguez.

ASSISTANT: How can I help you?

USER: Can you please help me in booking a flight ticket from Chicago to Los Angeles?

ASSISTANT: Let me know your travelling dates?

USER: I am planning to start my journey on Sept 17 and return back on Sept 19.

ASSISTANT: Can I know your airport codes?

USER: My travelling airport codes are ORD and LAX.

ASSISTANT: Connecting flight can be booked with airline AA for price 200. Shall I book a ticket?

USER: Please proceed.

ASSISTANT: Ticket is booked having flight number 1000.

USER: Thank you for booking.

ASSISTANT: Thanks.