Who is starring in the latest production of "Phantom of the Opera" on Broadway?
user
Wow, that’s a very broad question.  Could you give me a little more info about who you’re asking about, and maybe some specific details about the show?
assistant
I want to know what actors are in the lead roles.
user
Well there’s Christine, played by Cristin Milioti.  And there’s Raoul, played by Aaron Tveit.
assistant
Who is starring in the latest production of "Phantom of the Opera" on Broadway?
user
Wow, that’s a very broad question.  Could you give me a little more info about who you’re asking about, and maybe some specific details about the show?
assistant
I want to know what actors are in the lead roles.
user
Oh, so you’re looking for “who’s in the cast of Phantom of the Opera”, rather than “who is starring in Phantom of the Opera”.
assistant
Who is starring in the latest production of "Phantom of the Opera" on Broadway?