If they were the first to use the mark in commerce then you would not be able to simply add "professional" to your name and avoid getting into a trademark dispute with them over the name because it would be considered derivative use. Even if you had the web address with that name first, you have to prove actual use in commerce. You do have one possibility to avoid a conflict and a claim of likelihood of confusion, which is the standard used in trademark law and that is by naming your product (for example) "Joe's distribution report manager" and in an event like that you would in most likelihood be able to argue that your name is merely descriptive and not infringing on any of their name rights. Since "distribution report manager" or "scheduling report manager" is merely descriptive of the functions of the software, it would not be capable of achieving trademark status. You are going to have to rework your name though to avoid the likelihood of confusion with their name and to avoid them trying to sue you over the name. Perhaps something like, "Management Report Professional" would be even better because it does not even look like their name.
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