Workflow to loop multiple list items

@Swati .....You need to build site workflow and follow below steps:

• Use calculate date action to get a 15 days back date i.e. Today-15
• Query your list using query list action. 
  • Filter your items which are greater than equal to "Today-15" and less than "Today"
  • Get all the fields you want including ID column and store each of them in seperate collection variable
• Using for loop, index variable (number) and collection ID
  • Inside this for loop, using parallel action, collection operations, get individual values of all the other collections
  • Use build string to build table HTML code
• Once for loop is over, send the email communication