
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 the function $f(x)= \sqrt {3}\sin (\omega x+\varphi)$ ($\omega > 0,- \dfrac {\pi}{2}\leqslant \varphi < \dfrac {\pi}{2}$), its graph is symmetric about the line $x= \dfrac {\pi}{3}$, and the distance between two adjacent highest points on the graph is $\pi$.  
$(1)$ Find the values of $\omega$ and $\varphi$;  
$(2)$ When $x\in[0, \dfrac {\pi}{2}]$, find the maximum and minimum values of the function $y=f(x)$.

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