title: How to extract two slot values having time in RASA
body: <p>I have a FormAction for Applying Leave which requires 3 fields</p>
  
  <p>Leave_Type
  Start_Date
  End_Date</p>
  
  <p>Now how to extract date and set appropriately in the slots. As the user input can simply be just a date value like - “12/09/2017” or “12 July 2007” or “Sept 21 2016”. The Form will prompt for each of the slot.</p>
  
  <p>Duckling provides a way to enter range but for that user query should be like- "I want to apply leave from 12/2/2018 to 13/2/2018". But my bot prompts user with FormAction for each slot. So when bot asks for Start_Date the input date should be mapped to Start_Date slot</p>