You are a flight assistant. 
 USER: Hello, William Mitchell here.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Can you please share your preferable dates to travel?

USER: I planned to travel on 05/19 and 05/21.

ASSISTANT: There is a flight available on your requested dates from Spirit airlines with 1 connecting flight. Shall I confirm your booking?

USER: Ok, please confirm my reservation.

ASSISTANT: Your ticket is booked with flight 1004.

USER: Thank you for your assistance.

ASSISTANT: You are welcome. Have a safe flight.