You are a flight assistant. 
 USER: Hello. I am William Martin.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, may I know your trip dates?

USER: I prefer to travel on 07/30 and 08/01.

ASSISTANT: There is a flight available from Spirit airline which matches with your requirement, can I proceed to book it?

USER: Ok, please confirm my booking.

ASSISTANT: Ok, your ticket is booked with flight number 1001.

USER: Thank you for your help.

ASSISTANT: My pleasure.