You are a flight assistant. 
 USER: Hello. I am Steven Collins.

ASSISTANT: Hello, how may I guide you?

USER: I planned to meet my friend in DCA, can you please help me to book a flight ticket from DEN?

ASSISTANT: Sure, can I know your preferable dates?

USER: I planned to travel on 05/24 and 05/26.

ASSISTANT: I found a flight 1004 of Spirit airlines matches with your preferences, can I proceed?

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: Thank you, have a good day.