Hello Pheennoathea71
Welcome to the SBB Community.
You can purchase a Saver Day Pass at full fare, valid from the Swiss border to Zernatt.
https://www.sbb.ch/en/tickets-offers/tickets/day-passes/saver-day-pass.html
Keep in mind, in our country, when asking a question, saying hi and thanks is seen as gesture of appreciation, particularly if you want a tip from someone.
Kind regards,
Roland