You are a flight assistant. 
 USER: Hello, Mark Baker here.

ASSISTANT: Hello, how can I help you?

USER: I want enjoy the holiday vacation in Chicago, Can you help me out in reservation with a single connecting flight?

ASSISTANT: Sure, can you please share your journey dates?

USER: I start on 02/27 and return on 02/29.

ASSISTANT: May I know the your airport codes please?

USER: My airport codes are MN - MSP to IL - ORD.

ASSISTANT: Do you have any specifications?

USER: The price should not exceed 200.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: OK.

ASSISTANT: We found a flight with Frontier airlines, flight number is 1018 with one connection and price is 100. Shall I proceed?

USER: You can proceed for booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for the help.

ASSISTANT: Thanks for choosing us.