My instructor didn’t come to the meeting or reply to my message. It was so disrespectful. How should I deal with?

He made an appointment to help me on certain case, but he didn’t show up and he didn’t reply to my message all day long. What should I do? Especially if he texts me how should I answer?
My instructor didn’t come to the meeting or reply to my message. It was so disrespectful. How should I deal with?
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