Спасибо за Ваше приглашение.На сего

Спасибо за Ваше приглашение.
На сегодняшний день наш бюджет по выставкам на 2015 год уже утвержден и
к сожалению мы не планируем принимать участие в Вашей выставке.
Возможно наши коллеги посетят ее в следующем году и примут решение на участие в 2016 году.
Тогда мы дополнительно уведомим Вас, если примем такое решение.

Результаты (английский) 1:

Thank you for your invitation.To date, our budget for exhibitions in the year 2015 is already approved andUnfortunately we do not plan to take part in the exhibition.Perhaps our colleagues will visit it next year and decide to participate in the year 2016.Then we will notify you if you take such a decision.

Результаты (английский) 2:

Thank you for your invitation.
Today, our budget for exhibitions for 2015 has already been approved and
unfortunately we do not plan to take part in your show.
Maybe our colleagues to visit it next year and decide to participate in 2016.
Then we further notify you, if we take such a decision.

Результаты (английский) 3:

Thank you for your invitation.
to date, our budget exhibits for the year 2015 has already been approved and
unfortunately we are not going to participate in your exhibition.
Perhaps our colleagues will visit her in the next year, and will take a decision on participation in 2016.
then we further will notify you, if you take such a decision.