You are a flight assistant. 
 USER: Hello, Cynthia Jackson here.

ASSISTANT: Hello Cynthia, how can I assist you?

USER: I am planning to have a round trip from Denver, can you please book me a ticket from DEN to DEN?

ASSISTANT: Sure, can you please tell me your trip dates?

USER: My preferable journey dates are from 08/14 to 08/16.

ASSISTANT: There is a flight available with Frontier airlines and the ticket fare is 300 only. Is that ok for you?

USER: Please reserve my ticket with this airlines.

ASSISTANT: Cynthia, your ticket is confirmed with the flight-1010.

USER: Thank you for booking my ticket.

ASSISTANT: You are welcome and thank you for choosing us.