I'm a lead developer of one of codebases which is heavily reliant on atleast 6 different apps. Apart from my projects own milestones, I also have its own bugs/f

I'm a lead developer of one of codebases which is heavily reliant on atleast 6 different apps. Apart from my projects own milestones, I also have its own bugs/fixes. Then every other day some one wants a feature. The requests are so overwhelming that I do , "please speak to my manager". Because thats the only valid way of getting things done on a agreeable time, the time at which both me and the person expecting the feature can reasonably expect.