靠谱 Reliable. Said of what is sensible and makes sense. A dictionary example: “This person does things reliably.”
放鸽子 To release the pigeons. To break an appointment and lose someone’s trust.
凡事有交代，件件有着落，事事有回音 Every matter accounted for, every item settled, every message answered. A business article says that some people define being reliable by these three things, and that the three are really one: closing the loop.