I assume the TravelerID that you want to pass into the dialog is ready on the qSIListView. If that is the case, when you define the GoToUrl action and add query string parameter, you can specify parameter input source type as "ListItem", I believe that is what is called. If it were qSIListForm, the source type would be "Input". Then you specify the source name which corresponds to the column name of the TravelerID and your query string name. This should allow you to open a dialog with the proper URL – you can check it by right click inside the Dialog and view the property for the URL string.
I think there is a trick, you must select the row in qSIListView in order for this to work. And I believe this trick works for Session as well but Input as source type won't work because it is qSIListView.