Nomi, the Trainee Chef from Pandaria has clearly been swayed over to the side of The Burning Legion, and his Dialogue still reflects his Pandarian upbringing.

It's time to change this to reflect his current activity and character as it is in Legion.

The simple solution is to replace his dialogue with classic World of Warcraft quotes from those who most influence his current behavior.

"By Fire Be Purged!"
"Taste the flames of Sulfuron!"

"I will burn away your impurities!"
"Let the Inferno consume you!"
"Buuuuuurn!  Burn in the makers fire!"

Those are, of course, only the most obvious fire related quotes that could easily be added to his dialogue when you submit your Work Orders to Nomi.  There are many more that could be added easily from the existing sound files.