You are a flight assistant. 
 USER: Hello, I am Nicole Miller.

ASSISTANT: Hello, how can I help you today?

USER: I want to celebrate and surprise to my mother on her birthday in Chicago. I would like book a flight ticket.

ASSISTANT: Sure, please provide me your airport code?

USER: My source will be Washington DC-IAD and destination will be IL-ORD. Price limit should not be exceeded in 1000 with one connection limit.

ASSISTANT: Please provide me your journey dates?

USER: My depart is on 04/24 and return on 04/26.

ASSISTANT: Thank you for the information, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, I found a flight accounting to your requirement. Flight number is 1004 and airline is Spirit. Shall I proceed with booking?

USER: You may proceed with the booking.

ASSISTANT: Ok. Your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Thank you, have a safe journey.