<mat-form-field>
        <input type="text" placeholder="Give Rights" aria-label="User" matInput  [matAutocomplete]="auto" (input)="onSearchChange($event.target.value)">
        <mat-autocomplete #auto="matAutocomplete">
            <mat-option *ngFor="let user of users" [value]="user.displayName" (onSelectionChange)="setSelectedUser($event, user)">
                {{ user.displayName }}
            </mat-option>
        </mat-autocomplete>
        <button (click)="resetValue($event)">RESET</button>
    </mat-form-field>