What's this button for?

During check out there is a button X that seems to have no purpose, looks like could have been an "Empty you cart button" OR back to date/time you last were. But it does neither and the link is: What is the purpose of it?

www.yourssite.com/service-yourservice?date_from=&date_to=

See attached image for clarity

thank you,
Roger

Hi Roger,
That button will close the Checkout form and open the Booking table.
Thanks
Dam