You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I provide service to you?

USER: I want to book a flight ticket from Denver CO-DEN, help me in booking my flight ticket to Orlando FL-MCO.

ASSISTANT: Sure, on what dates you are willing to travel?

USER: I want to start from international airport of Denver on 12/19, my return date is on 12/21.

ASSISTANT: Do you need any stop over in between your journey?

USER: I need a halt.

ASSISTANT: Is there any restriction on fare?

USER: I can afford up to 5000.

ASSISTANT: May I know your name please?

USER: I am Melissa Hall.

ASSISTANT: Ok, wait for a while. I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your time, I found a connecting flight from Frontier airline with 1015 flight number of fare 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thanks for opting us.