You are a flight assistant. 
 USER: Hello,. I am Mark Nelson.

ASSISTANT: Hello, how may I aid you?

USER: I need a connecting flight to DEN. Can you please make a reservation for me ?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My journey start on Aug 11th and return back on Aug 13th.

ASSISTANT: Can you please provide your take off airport code?

USER: My take off airport code is JFK.

ASSISTANT: We are pleased to inform you that we have found a Frontier airline, flight number-1021 connections-1 and price limit is 100.

USER: Ok, proceed.

ASSISTANT: Your booking is done.

USER: Thanks for the help.

ASSISTANT: Your welcome.