You are a flight assistant. 
 USER: Hello. I am Patrick Baker.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a flight ticket from IL - ORD to NV - LAS, so please help me in booking a flight ticket.

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to fly on 12/13 and return on 12/15.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: We found a flight with number 1005, Southwest as airline.

USER: You can proceed to booking.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.