You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Michael Miller want to visit Washington to surprise my mom on her birthday. Can you book me a ticket on 03/23?

ASSISTANT: Sure, may I have your return date?

USER: I will return on 03/25. Make sure price should not exceed 500.

ASSISTANT: OK, do you need any connection limit.

USER: I need a single connection.

ASSISTANT: OK, can you provide me your airport codes?

USER: I will depart from IL-ORD to DC-IAD.

ASSISTANT: OK, please wait a minute, let me check and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a flight with Spirit airline and price of 100 and with single connection. Flight number is 1002. Shall, I proceed with booking.

USER: OK, you can proceed.

ASSISTANT: Sure, your ticket has been booked. Thank you, for reaching us.

USER: Thank you, have a nice day.