UML - Use Case Diagram for Vending Machine

Hello Everyone!
Here is an example of an Use case Diagram of a Vending Machine System.

Problem Statement -

A vending machine accepts coins for variety of products. The user selects the drinks from products available through selection panel. If the drink is available the price of the product is displayed. The user then deposits the coins depending on the price of the product. Coin collector collects coin after stipulated time the controller will compare the deposited coin with price. If amount deposited is less than price then error message will be displayed and all deposited coin will be dispensed by the coin dispenser else the drink will be dispensed by the product dispenser.

Check out other UML (Unified Modeling Language) Diagrams -

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