@Ivon2 it is not a reservation but either the INQUIRY or REQUEST.
There is a big difference between the two of them. If it is just an Inquiry you can just answer by text or preaproove or decline and it will not affect your listing in any way. So, to stop getting those prompts just click preaprove or decline. You can even refuse to give them special offer discount and click pre-aprove. Your guest will or will not book afterwards, it is up to them.
If it is an request then it means your guest already payed and if you accept then booking will be made instantly. You HAVE to click accept or decline button. If you decline to much request it will affect your ranking and you can even be penalized with unlisting.