Sonic The Hedgehog is the only voice of the Regal Cinemas trailer voiceover (well except amy will appear in the end to chase sonic) here is his lines for both the beginning and the end:

Beginning:

Welcome to Regal Cinemas 

Refreshments are available in the lobby, and please keep our theater clean by disposing the trash in specified containers

And Remember… gift certificates are available for any special occasion, 

enjoy the show

The Ending Part: 

Remember No Talking or using your devices during the movie, enjoy the show.l **hears Amy calling him** crap, that sounds like Amy, better run… enjoy the show