When applying for 90-day non-immigrant o online, can I just enter a tentative plane ticket I haven't purchased yet (pending visa approval) and unreserved accommodations (also pending approval)? Or do they actually check with airline and hotel/residence in the approval process? Or match up at entry or when they receive the tm30?

I ask because last time I extended tourist visa for 30 days, I just put the hotel I had been in most recently even though I checked out and went to a different condotel after leaving immigration office.