Emailing people who submit request forms from Wrike

After someone submits a request form, how can I email them within Wrike to communicate about the project. I see that if they upload a document of any kind I can make them a reviewer and add a note, but if they don't, I see no way to communicate to them within Wrike about the status of their project. This is important because we usually have people with multiple requests at the same time and they may not know what project we are talking about if we just email then questions or comments. Thanks.