本日はお乗りいただきありがとうございます！

Welcome aboard!

本日(ほんじつ)はお乗(の)りいただきありがとうございます！

Honjitsu wa o nori itadaki arigatō gozaimasu!

本日 (ほんじつ)

today

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

御 (お、おん)

honorific/polite/humble prefix

乗り (のり)

riding; ride; spread (of paints); (two)-seater; mood (as in to pick up on and join in with someone's mood); rhythm; feeling

頂 (いただき)

crown (of head); summit (of mountain); spire; easy win for one; something received

有り難う (ありがとう)

Thank you; Thanks

御座る (ござる)

to be

Readings: ホン、もと

Meanings: book, present, main, origin, true, real, counter for long cylindrical things

Readings: ニチ、ジツ、ひ、 -び、 -か

Meanings: day, sun, Japan, counter for days

Readings: ジョウ、ショウ、の.る、 -の.り、の.せる

Meanings: ride, power, multiplication, record, counter for vehicles, board, mount, join