You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am James Allen here, I would like to travel from DEN to DEN for a city roundup trip at Denver, can you please help me in this?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my dates of journey is from 06/23 to 06/25.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: There is a flight in Spirit airline with price 100, can I book it?

USER: Ok, please go ahead with the booking.

ASSISTANT: Your ticket has been booked with flight number 1018.

USER: Thank you for your help in reserving my ticket.

ASSISTANT: You are welcome.