Hello. Stephen Moore here.
Hello, do you need any help from us?
I need your help to book a flight reservation from DCA to LGA, can you help me?
Sure, could you please share your departure and arrival day?
Actually, I am planning to travel on July, 20 and return back to my city July, 22.
 found an economy class ticket in Spirit airlines with normal cost of 100 and it is a single connecting flight. Can I book your ticket?
You can proceed with this flight.
Ok, your reservation is confirmed.
Thanks for your help and information.
You are welcome, have a great day.