How can I populate the data on the reservation form?

With rails, moving over info is pretty easy, but I'm not sure how to do it in php.
I have a custom form set up which has the fields for the number of guests, the check in date, and the check out date.
What I'd like to do is to make it so that when I hit submit on the first form, it would populate the data on the reservation form.
The reservation is hosted on jotform

Hello Anthony,

Thanks for reaching out to us.

If you would like to populate your Jotform form using the data from other platforms, that's quite possible by following this complete guide. Please check and let us know if you are referring to something else or have further questions.