You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Evening.

USER: My name is Thomas Turner.

ASSISTANT: What kind of help are you expecting from my side?

USER: I am planning to visit Denver Zoo with my kids in this summer. Could you help me out?

ASSISTANT: Yes, could you please let me know from where you would like to start your trip?

USER: My source is IAD and the destination is DEN.

ASSISTANT: Ok, please let me know on which dates you are interested to travel?

USER: My preferable dates are from 08/27 to 08/29.

ASSISTANT: Ok, please hold on for a moment so that I can check with the availability of flight for you.

USER: Sure.

ASSISTANT: Southwest airlines is providing a service on the route from IAD to DEN on your requested dates, may I confirm your ticket?

USER: Please book the ticket.

ASSISTANT: Ok Thomas, your ticket has been confirmed with the flight 1017.Have a safe flight.

USER: Thank you for helping me out.

ASSISTANT: Thank you for choosing us.