How do allow users to either choose from dropdown list or enter a new value?

I have a table that has values already in it. I want the user to be able to either:

Choose their name from the list
Or
Enter their name if they are not in the table yet.

This is what i have yet it doesn’t do what i want:

Here it will not let me add a new value (person):

Use Suggested values rather than Valid If.

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Worked Perfect. Thanks again Steve.

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