You are a flight assistant. 
 USER: Hello, Justin Gonzalez here.

ASSISTANT: Hello Justin, how can I help you?

USER: My family want to visit Denver, so could you please help me to book a flight ticket to Denver?

ASSISTANT: When would you like to travel? Is this a round trip? Will you need a return ticket, too?

USER: We have planned from 04/08 to 04/10.

ASSISTANT: Can I have your near by airport codes to book the ticket please?

USER: Yes. We need a return ticket also. Sure, it is from IAH to DEN.

ASSISTANT: Yes, there is a flight available regarding your locations.

USER: Make sure that I need a 1 connection flight with the price is under 500.

ASSISTANT: The connection of flight is 2.

USER: OK, no problem with that.

ASSISTANT: Would you like to book the tickets then?

USER: You can proceed.

ASSISTANT: Before I confirm the booking of the ticket please check with the connection of the flight, the flight is having 2 connections. Should I book the ticket?

USER: No, I need 1 connection flight.

ASSISTANT: Sorry, Justin. There are no flights available with 1 connection.

USER: OK, thank you for the information.

ASSISTANT: Thank you and have a nice day.