You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Ashley Parker. I would like to book a flight ticket from DEN to SFO. Could you please help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 11/29 and return back on 12/01.

ASSISTANT: I found a flight 1019 of Spirit airlines matches with your preferences, can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for the help.

ASSISTANT: Thank you, have a good day.