Following the flood, as the ark was resting on Mount Ararat, Noah released a raven and dove from the ark at different times. The goal in sending these birds was to determine if the flood waters had abated enough for Noah and his family to leave the ark.
Then Noah sent out a dove. When it could find no dry place to set its feet, it returned to the ark (Genesis 8:8-9) with no indication that a place had been found to alight. The dove stayed with Noah until Noah sent it out again a week later (Genesis 8:10-11).
This time the dove came back with a freshly plucked olive lead in its mouth letting Noah know that the waters had subsided from the earth.
Then, in Genesis 8:12, Noah sends out the dove one more time, but the dove did not return to him anymore. The dove had fulfilled its mission.
The raven was Noah's first attempt for an answer. However, the raven failed Noah. The dove, unlike the raven, came back each time until it brought proof to Noah that the water had receded. The dove did not disappoint Noah because doves can be trusted. Noah expected that the dove would return and it did.
The dove proved faithful and was miraculously guided by God to deliver the hopeful message about the receding waters. The raven failed, but the dove didn't.
If you are not getting the results you expect, perhaps you are sending out the wrong bird. If you aren't getting any results at all, you might consider changing your birds!