You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to head to Denver to give a seminar, can you help me to book a flight ticket?

ASSISTANT: Yes, I am here to help you. Please provide your price limit to book the flight.

USER: The ticket should be under the price limit 5000.

ASSISTANT: Ok, to proceed further I need to know the airport codes.

USER: My airport port codes are CO-DEN to MI-DTW.

ASSISTANT: Would you share your journey dates?

USER: Yes, I will start on 04/24 and return on 04/26.

ASSISTANT: May I know your name please?

USER: I am Margaret Hall.

ASSISTANT: Do you have any connection limit?

USER: I need one connection.

ASSISTANT: There is a flight in UA airline. The flight number is 1020. It has singe connection.

USER: Ok , you can proceed.

ASSISTANT: Ok, your ticket has been booked with the price of 100.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.