I need help understanding and fixing my output. why i keep getting $\text{'}$No team conference matches found for the star players.$\text{'}$ output?

print$(\text{'}$This is a $2024$ NBA playoffs preference simulator'$)$

teams $=$ input$(\text{'}$Please enter your preferred finals matchup: $\text{'})$

conference $=[\text{'}$Eastern$\text{'},$ 'Western'$]$

teams $=[[\text{'}$Boston Celtics', 'New York Knicks', 'Indiana Pacers'$],$

$[\text{'}$Dallas Mavericks', 'Minnesota Timberwolves', 'Denver Nuggets'$]]$

star$\_$player $=[[\text{'}$Jason Tatum', 'Jalen Brunson', 'Tyrese Haliburton'$],$

$[\text{'}$Luka Doncic', 'Anthony Edwards', 'Nikola Jokic'$]]$

def get$\_$team$\_$conference$($teams$,$ conference$)$:

flag $=$ set$()$

for index in range$($len$($conference$))$:

for word in teams$[$index$]$:

if word in star$\_$player$[$index$]$:

flag.add$($index$)$

break

return flag

observe$\_$team$\_$type $=$ get$\_$team$\_$conference$($teams$,$ conference$)$

if observe$\_$team$\_$type:

for index in observe$\_$team$\_$type:

print$($f$\text{'}$Your preferred finals matchup will have $\{$star$\_$player$[$index$]\}$ facing off against $\{$star$\_$player$[$index$]\}.$ This should be fun to matchup!$\text{'})$

else:

print$(\text{'}$No team conference matches found for the star players.$\text{'})$