For example, you could make a low whistle sound.
If you are unable to position the cage at eye level, crouch down when looking into the cage so that you don’t intimidate the birds.
They may even respond to your voice with chirps, but don’t expect them to mimic your noises.
At minimum you should try and spend at least an hour in the room with their cage. The more time you spend in the room with them the quicker you will bond with the birds.
The door does not need to remain closed at all times, but should be closed if the house becomes loud or there is lots of activity happening that might frighten your finches.
You may need to handle the bird in order to clean out the cage, or to remove aggressive or injured finches from the cage.
If your bird has bonded with you, then it will know the sound of your voice and will feel reassured by your presence.
If multiple finches are kept in 1 cage, they may bond with each other instead of you. This is why it is important to isolate them during training.
This process will likely take a few days and can not be rushed.
For example, you could place some fruit or insects inside the cage. Your finch will likely be unable to resist.
