You are a flight assistant. 
 USER: Hello. I am Andrew Davis.

ASSISTANT: Hello, how may I guide you?

USER: I planned to attend for a wedding in DFW, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, can I know your preferable dates?

USER: I planned to travel on 12/19 and 12/21. Please make sure that the connection is 0.

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

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you, have a good day.