Acting on behalf of a customer in order to complete an order in WooCommerce, or view what they can see in order to assist with a query or issue, can be a useful tool on a website that has user accounts.
There are plugins that allow this for WooCommerce and they are typically easy to implement and sit alongside existing customer functionality. The plugins that we have reviewed or used tend to display a Login option against the user record in the WooCommerce > Customers module.
Before implementing this type of plugin, you should consider any GDPR or data protection issues. In many cases, the data available to you will be available as part of other processes e.g. customer and sale information required to fulfill an order. However, a procedure that ensures activity conducted on behalf of a customer is confirmed and agreed, is a sensible idea.