David Ngog and Jermaine Beckford scored the goals as defeat for the Cherries was the first time this season they have failed to score and means the club have only won once in seven games.
Charlie Daniels and Rantie had the best chances for the home side but they never really looked like scoring.
Howe said: "You always want your striker scoring goals regardless of who it is.
"Rantie is performing well and at the hub of the assists for us. He hasn't found the net for us but that will come in time.
"We believe in the player and we are doing a lot of work with him behind the scenes to make sure he eventually does find the net.
"When you do not win regularly we are disappointed but from my perspective I have never lost sight of where we are heading.
"This year was always going to be a difficult transition for us. We went from the wrong end of League One to the middle of the Championship but I think we deserved something from the match."