I started my new job yesterday and they left me alone to cover the reception with very little training what should I do?

I started my new job yesterday and they expected me to cover the main reception without any training I literally just watched a girl for 1 hour and was left in the reception area myself for a full afternoon with nobody around to help me dealing with customers I couldn’t answer their problems and phones were constantly ringing as I couldn’t remember from my very brief morning shadowing

I started my new job yesterday and they left me alone to cover the reception with very little training what should I do?
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