# Declare path
$Path = 'filepath'

# Get Data
$Names = Get-Content -Path $Path

# forEach loop
forEach ($name in $Names) {
    
    # Split values
    $name = $name.split(' ')

    # Set each split half to a variable
    $lName = $name[0]
    $fName = $name[1]

    # Set variables to first and last names
    $user = (Get-ADUser -Filter "GivenName -eq '$lName' -and Surname -eq '$fName'" -Properties UserPrincipalName -ErrorAction SilentlyContinue).UserPrincipalName
    
    # If found, print email, else print first and last name
    If($user) {
        Write-Host $user
    } else {Write-Host "*Email Not Found*" $fName $lName}
}