I'd just write 'travel plans' and not go into details. The reason they ask for a reason? Probably because there's a space in the form for it.IRCC rep said this is a route I can take but in the email he sent, one of the points is "Reason why application should be processed separately". I am originally from India; I don't have to travel yet but may have to travel next year to a country where Canadians can travel visa-free.