
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given that $m$ and $n$ are real numbers, and when $2m=6-n$, the point $P(m,n+2)$ is called a "joyful point".  
$(1)$ Please write down a "joyful point";  
$(2)$ In the Cartesian coordinate plane, if the point $P(a,-a+3)$ is a "joyful point", determine in which quadrant the point $P$ lies, and find the coordinates of the midpoint of $OP$.

Present the answer in LaTex format: \boxed{Your answer}
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