And of all the date options available, Tifa is arguably the most popular.
(Both of which are excellent options in my opinion, but I digress.)
This guide applies to both the original PS5 Final Fantasy 7 Rebirth release and the recent PC port.

Tifa Conversation Dialogue
Conversation options with Tifa play a big role in influencing her relationship affinity.
3 star responses are the best, and 1 star responses the worst.
These are the specific conversations and dialogue options you want to watch out for, divided up by Chapter.

She’ll ask: “This rank remind you of anything?”
At the mini-bar near the beach, you’ll see Tifa sitting alone.
Talk with her and she’ll say: “Feels like it’s been ages since Seventh Heaven.”

Talk with her until she asks: “What sorta thing wouldyougo for?”
All of your party members will be standing around the bonfire at the Cosmo Canyon festival.
Talk with Tifa and she’ll say: “Did I sound as awkward as I felt?”

Go to the second floor of the treatment centre in Tifa’s old house and talk with her.
She’ll say: “It was taking a toll… Then you turned up.”
A high affinity with the blue smiley will trigger an intimate cutscene.

