Using Calendly JavaScript API call in a React app, How to set start_date and end_date to Calendly that users have to choose between them?

Calendly.initInlineWidget({
 url: 'https://calendly.com/YOUR_LINK/30min',
 prefill: {
  name: "John Doe",
  email: "john@doe2.com",
  customAnswers: {
   a1: "Yes",
   a2: "At the Starbucks on 3rd and 16th"
   }
 }
});