Reports of the conversations which has happened over time, can be viewed in the Reports Section. Click on Reports on home page.
The below window opens up with Overview of the Reports.
Report can be generated for various durations. This can be done by selecting the time period in the drop-down list as shown below. By default, it is for last 7 days.
Click on Conversations tab in Reports. The graph will show the conversation happened on the selected days. On pointing the mouse to a particular graph of the day, the details of the conversations happened on that day can be found out. An example is given below. On September 12, 8 conversations occurred.