Last year the need to present boarding cards on narrow-bodied aircraft was eliminated. It helped to expedite boarding (no rip 'n' tear) and assisted with on-time performance. Having said that call me old school. I preferred taking a boarding as a first point of contact, referring to an individual by name, recognizing FF status, and where possible saying hello in their native tongue beyond Hello/Bonjour.
(Hola/Buongioirno/Shalom/Ni Hao/Koneechewah, etc). That's just me.

Please and thank you? Always .