If they are a nonresident alien then they cannot use TurboTax since they would have to use IRS Form 1040NR to file a federal tax return.  TurboTax does not support Form 1040NR.

See this TurboTax support FAQ for a Form 1040NR - https://ttlc.intuit.com/community/forms/help/does-turbotax-handle-form-1040nr-for-nonresident-aliens...

The person is a first time filer and for tax purposes he is considered RESIDENT. Like I said, he does not have SSN nor ITIN. So, what is his alternative?

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@asena0723 wrote:

The person is a first time filer and for tax purposes he is considered RESIDENT. Like I said, he does not have SSN nor ITIN. So, what is his alternative?

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He would have to apply for an ITIN through the IRS - https://www.irs.gov/individuals/how-do-i-apply-for-an-itin

IRS Form W-7 - https://www.irs.gov/forms-pubs/about-form-w-7