Create script/application for data entry into javascript-based platform from automatic emails

I need a script or application that can recieve data from an automated e-mail and go to a specific web page and enter that data into a javascript interface. The data needs to be reparsed during the process to fit with what the javascript interface asks for. The data comes in the email like the following example. First the checkin date, then the checkout date, then the room type. Example: 27/05/2016, 28/20126, Dubblerum The web page will need you to slect a date according to the following format, according to the example: "den 27 may 2016" The system does not accept month names in English, a translation table will be provided. After inputing date, the system will present a number of links. Which link to follow will depend on the room type. If several room types are present in the automated e-mail, the script has to follow several links. After clicking the link(s), there are several input forms, one is to set the checkout date according to the same format as previously, another input field has to be decreased by one. After this a link to finish the interaction has to be clicked. I need this to work with Windows 7 or OS X. I will provide any information you request that is within my reach.