Unfortunately you need to look at both the JL COC and the fare rules for the specific ticket as well as anything which Trip has over and above those. While this may be a tough time for you and thus a task to pass off to someone else, either you or that someone really needs to sit down and read very carefully through both sets of conditions. That will answer the question of whether you are entitled to a refund and, if so, how much. Do not accept the word of front line agents,
If the rules do not provide for a full refund, you are then down to a gesture which might include a rebooking for a later date rather than a refund. But, do not count on it and no matter what, it's critical to understand what you are due as of right and what you are seeking.