Hi @Emi_Mwendapole,
Welcome to Airtable Community !
If you want them to enter 2 dates in the same record (like available from - to) then yku need to create a new field in your table. If you want them to enter a nee date that will create a new record, then they will have to submit the form again.
Think of it that way, where will the other date show?
BR,
Mo