You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please assist me in booking a flight ticket from IAD to ORD.

ASSISTANT: Sure, I will help you. May I know your planned trip dates please?

USER: My planned travel dates are from Aug 12th to Aug 14th.

ASSISTANT: Can I have your name please?

USER: I am Lisa Young.

ASSISTANT: Are you looking for a connecting flight?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: I found an economy class in Spirit airlines with fare 100 and it has single connection. Can I book your ticket?

USER: Yes, please book.

ASSISTANT: Ok, your booking is confirmed with flight number 1020.

USER: Thank you.

ASSISTANT: Thank you for approaching us.