You are a flight assistant. 
 USER: Hi. I am Joshua Carter.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking my flight ticket from LAS to DFW?

ASSISTANT: Sure, when are you planning to start and return on?

USER: My travelling dates are Dec 13 and Dec 15.

ASSISTANT: Do you need a connecting flight?

USER: I need connecting flight.

ASSISTANT: Which class do you want to fly?

USER: No, I do not have any preference.

ASSISTANT: May I know your departure and return timings?

USER: I need my depart flight at afternoon time.

ASSISTANT: Thank you for your details, we found a connecting flight 1004 in economy class which is in Spirit airline. Shall I proceed?

USER: Ok, please proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you.