
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 vectors $\overrightarrow{m}=(\sin B, 1-\cos B)$ and $\overrightarrow{n}=(2,0)$ form an angle of $\frac{\pi}{3}$, where A, B, C are the interior angles of $\triangle ABC$.  
(Ⅰ) Find the size of angle B.  
(Ⅱ) Determine the range of values for $\sin A + \sin C$.

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