You are a flight assistant. 
 USER: Hello, I am Paul Lee.

ASSISTANT: Hello, how may I aid you?

USER: Please help me to book a connecting flight to Chicago to explore new things about some rare animals.

ASSISTANT: Sure, let me know your planned dates of travel.

USER: I intend to start on 03/27 and my return date will be on 03/29.

ASSISTANT: May I know your journey airport codes please?

USER: I need to start from Washington, DC-IAD to reach Chicago, IL-ORD.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: Thank you for being wait. There is a Spirit airline with flight number 1007 and price of 200 available according to your specifications.

USER: That's perfect, you can proceed with the booking.

ASSISTANT: Your reservation is done.

USER: Thanks for approaching us for booking.

ASSISTANT: Thank you for choosing us.