@Taina0 you are possibly being scammed. At the end of the day you can only help as much as you can. Let them put in a confirmed booking. Even if it is incorrect, you can then go into your reservation and click on change. There you can redo the booking as they actually want it. They just then have to hit the confirm button at their end. If they continue to drag it out and offer you other alternatives, move on. Doing cash on arrival is a big mistake, they want to take you outside of the protection that Airbnb affords you.
What you experience is typical for new hosts on Airbnb with whom scammers target the most.
Did it help? Thumbs up then!