
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 an ellipse $\dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{b^{2}}=1(a > b > 0)$ with eccentricity $\dfrac { \sqrt {2}}{2}$, the left and right foci are $F_{1}$ and $F_{2}$ respectively, and the left vertex is $A$, where $|AF_{1}|= \sqrt {2}-1$  
(Ⅰ) Find the equation of the ellipse;  
(Ⅱ) If a line $l$ passes through $F_{2}$ and intersects the ellipse at points $M$ and $N$, find the range of values for $\overrightarrow{F_{1}M} \cdot \overrightarrow{F_{1}N}$.

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