You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Carol Adams, willing to travel Chicago, IL - ORD on 09/29. Assist me to book a flight ticket.

ASSISTANT: Sure, can I know your departure code and return date please?

USER: Sure, my source is Orlando, FL - MCO and my return date is on 10/01.

ASSISTANT: Ok, wait a moment please.

USER: Ok, sure.

ASSISTANT: There is a flight in Delta airline, shall I proceed?

USER: Yes, proceed.

ASSISTANT: Your ticket has been booked with flight number 1010.

USER: Thank you for the booking.

ASSISTANT: You are welcome.