Change values ​of a variable for an if conditional on r

I want to create a function that according to a condition modifies the value of a variable, or leaves it as it is. So I have these two objects which are integers:

q <- L()
q_a <- L()

And the function:

convert.q <- function(q){
  if (q >= 3){
    q_a == 3
  } else {
    q_a == q_a
  }
}

convert.q(q)

This function is returning me a FALSE statement when executing it. Any idea how to solve it?

Just an example of what I want:

q <- 10
q_a <- 10

convert.q(q)

Result:
q_a == 3

I tried changing variables to numeric, but the result was the same.