Compact, rapid-fire cafe exchange. ご注文は? is an elliptical question (omitted 何ですか). アイス付きで? uses 付き ('attached, with,' from 付く) as a suffix: 'with ice.' まいど is an old-school/traditional shopkeeper phrase used to greet returning customers — literally '(thank you for coming) every time,' short for 毎度ありがとうございます. Particularly associated with Osaka and Kansai-style family-run shops. Very informal, very warm.