My dear Fortunato, you are luckily met. I have bought some Amontillado, but you weren't around. Please help me.
Nonsense, it is merely just a cough
There is nitre in the vaults, come back,your health is to important
Fortunato please be careful going done the steps!
Nonsense! Utter Nonsense. Now lets go on!
And I to your long health
Let us drinkto the buried around us, hahaha!
The part of the story where Montresor says to Fortunato to be careful on the steps is Situational Irony, because we know that Montresor Want to kill him, and why would he care if Fortunato hurts himself on the stairs? This helps create suspense because in the story because you question why is he being so nice, and worrying about the man who he is about to kill, but his builds suspense because by showing us that Montresor has avery smart and well though out plan, and he does not need to be worry about killing Fortunato yet