Add a multiselection to the result table, which will add you a checbox.
And add an item called exportButton and assign your VO,
then you will get a button in the table, when you click on that the data will get exported.
Note: In the subject instead of "Hi pls revert back urgent", if you mention the real subject like, export data to excel
it will be useful for the people to answer and search in future also.
That is depending upon your rquirement,
if you want to give an action button and save the selected rows then you need to have one attribute in the VO,
or you can just assign a transient attribute(which doesn't need to be assigned to any table attribute).