Can anyone help me with the meaning of David Suttons poem “Another Small Incident”?

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I am writing an essay on David Sutton’s poem “Another Small Incident” but I am having a little difficulty decoding the meaning of the poem, the use of language and structure etc. Here is the poem can anyone help me out! November evening, rain outside and dark Beyond the building’s honeycomb of warmth. The old man stands there, waiting to be noticed. He wears propitiation like a coat. The girl looks up at him. “Yes? Can I help you?” “This card you sent like, that’s the problem, see. It says I’ve got your book, but that’s not right. I mean, I had it but I brought it back. That’s what I do, I read one, Bring it back. I never keep them, see.” He stands, condemned Yet quivering for justice. “All right sir.” She smiles at him. “We get mistakes like that. Just leave the card with me.” He stares at her, Seventy, with spotted hands. Afraid, And someone smiles at him and calls him sir. Lighting at the contact, like a bulb, He warms to her. “That’s what I do, you see. I take the one, I read it, b