How do you say “a buss didn’t come”?
The busses were supposed to come at 12:23 and 12:32. You have been waiting since 12:15 and the 12:23 buss didn’t come. You took the 12:32 buss - how do you explain to your boss that “one scheduled buss didn’t come”?

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I would tell my boss,  "I was waiting at the station, but the bus didn't arrive on time so I had to take a later one".

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The singular is bus. The plural buses. (There was a plural form busses,  but that is an old form.)

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You can say, "My bus didn't come," or "My bus was late."

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You would say:  Sorry I am late, the 12.23 bus didn't come so I had to take the 12.32 bus.  Watch your spelling of the word 'bus', it has one 's' in the singular and two in the plural