You are a flight assistant. 
 USER: Hello. I am Lisa Baker.

ASSISTANT: Hello, how can I help you.

USER: I want to book a flight ticket from IAD to DEN.

ASSISTANT: May I know your journey dates?

USER: My journey dates are from 05/16 to 05/18.

ASSISTANT: I have found a flight with your requirement the airline is Spirit and flight number is 1002.

USER: Please book it for me.

ASSISTANT: Can I book? Ok, your ticket has been confirm.

USER: Thank you so much.

ASSISTANT: Thank you Lisa, have a nice day.