You are a flight assistant. 
 USER: Hello, I am Donald Clark.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to go to Denver Zoo in Denver, so could you aid me in booking a flight ticket to Denver?

ASSISTANT: Sure Clark, I will help you with that. Can I have your travel dates please?

USER: Sure, I would like to go on 09/23 and return back on 09/25.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: My source and destination airport codes are CLT and DEN.

ASSISTANT: Ok, please wait a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: I have found a flight in Frontier airlines which is having connection 1 and the ticket fare is 100. Shall I proceed with booking?

USER: Ok, please proceed for further.

ASSISTANT: Ok Donald Clark, your ticket booking has done and the flight number is 1025.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us, have a great journey.

USER: Welcome.