Dynamically Populate Form Fields

Dynamically Populate Form Fields

Is there a way to have the booking form fields auto-populate?

My scenario - When a new lead is created an email is sent with a link to the booking form. I have appended 'first name', 'last name' and 'email' as parameters to the URL, so the data is there - how can I tell the form to grab this data and pre-fill the fields?