I will never forget when I started writing I had a horrible habit of leaving my readers saying, what, who said what? Lol

"Billy, I will not tell you again to clean up this mess," my mother snaps.

"I will in one second, mom," I reply. 

"There is no justifying you choosing to put yourself in bed with my cousin, James," I hiss.

It is so important to let your readers know who is speaking. Lol 

I said, he glares, she retorts...Examples

Said
Say
Retort
Glare
Respond
Growl
Snarl
Snap
Groan
Bawl
Sob
Cry
inform(s)
Whisper
Taunt
Tease
Tremble
Assure
Insist(s)
Sniffle
Hiss
Blab
Reply
Command
Demand
Bolster
Threaten
Grin
Smirk
Suggest
Assume
Guess(ing) 
Grant
Oblige
Obey
Comment
Persist
Ask(s)(ed)
Question
Offer
Demonstrate
Validate
Brag
Scoff
Sigh
Seethe
Warned
Admonished
Dismissed(es)
Recall(s)
Groans
Whines
Winces
Bellows
Inquire
Stammer
Stutter
Screech