According to the following link the laptop has a microphone.
https://kelaptop.com/en/dell-inspiron-7000-7373-ins-1157-gry
Do verify that I correctly identified the laptop in question.
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Look in Device Manager: Audio inputs and outputs.
Alsoc heck that under the View tab that "Show hidden devices" is checked.
Any microphones listed?
Ensure that the microphone is enabled.
Try running the built-in Windows troubleshooters. The trouble shooters may find and fix something.