「いらっしゃ～い」「よぉ」「なんだ、啓太か・・・」

「」「」「、・・・」

"Welcome~" "Yo." "Oh, it's just you, Keita..."

Literal

"Welcome~" "Hey" "What, Keita [copula-か]..."

A three-line izakaya or shop entrance scene. いらっしゃ~い is the drawn-out casual version of いらっしゃいませ ('welcome'). よぉ is a rough masculine greeting. なんだ、啓太か ('oh, it's Keita') uses なんだ ('what is it') + か to express mild disappointment — the greeting drops in energy upon recognizing a regular rather than a new customer. The ellipsis (・・・) trails off to suggest deflated enthusiasm. Pure naturalistic dialogue.