LightningLookup.cmp

<aura:component implements="lightning:availableForFlowScreens,flexipage:availableForRecordHome,force:hasRecordId" access="global">
    <aura:attribute name="objectApiName" type="String" access="public" />
    <aura:attribute name="fieldLabel" type="String" access="public" />
    <aura:attribute name="fieldName" type="String" access="public" />
    <aura:attribute name="selectedRecordId" type="String" access="public" />
    
    <lightning:recordEditForm objectApiName="{!v.objectApiName}">
        <label class="fieldLabel">{!v.fieldLabel}</label>
    	<lightning:inputField fieldName="{!v.fieldName}" onchange="{!c.handleOnChange}" />
    </lightning:recordEditForm>
</aura:component>