You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am David Hernandez. I would like to book a flight ticket from DEN to CLT. Could you please help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 07/25 and return back on 07/27.

ASSISTANT: I found a flight 1021 of Spirit airlines matches with your preferences, can I proceed?

USER: Your ticket is confirmed.

ASSISTANT: Your ticket is booked.

USER: Thank you for the help.

ASSISTANT: Thank you, have a great day.