How to reduce noise while drilling?
Not really.

Drilling is an inherently noisy activity. There may be low noise drills, but the act of rubbing hardened steel against brick at high speed will make a lot of noise. Lower speeds will reduce the noise, but you will take longer to make the hole. Using the hammer action will increase the noise, so try and avoid that if possible.

The best you can do is talk to your neighbours and explain what you are doing and when you'll be working. Ask them if there are any times they'd prefer you not to drill and try to stick to these times.

I'm assuming you're doing large scale renovations to your house - so give them an idea of how long you'll be working on the project. If they can see an end in sight, they might be more forgiving of a bit of noise and disturbance now for a quiet life later.