、、。
The flight is JL123, August 23rd, to Tokyo.
Literal
Flight-name [topic-は] JL123-flight, August-23-day, Tokyo [to-まで] is.
A terse, information-packed booking-context sentence. まで marks the destination ('as far as Tokyo') rather than a time limit. The full-width characters ＪＬ１２３ and ８月２３日 are standard in Japanese text. Note 便 used in its 'flight/service' sense — the same character as in 便利 and 便り.