Why can't I slide my messages over and reply on the lock screen but my roommate can?

[iMore Question]

When a message appears in my lock screen and I try to slide it over to reply it will only let me clear it, but on my roommate's phone it gives her the choice to reply or clear the message. Why isn't mine the same?

 

[Tartarus]

Use force touch. You're probably on an iPhone 6s.