DECLINE DINNER INVITATION

Dear Felix

It was really nice of you to invite [us / me] to dinner on [DATE, ex. Friday]. I appreciate your hospitality. That is why I regret that [I / we] have previously made plans for that date. {Perhaps we can rearrange for sometime [TIME WINDOW, ex. next week]}.

Thanks again for the invitation. [I / we] look forward to seeing you soon.

Regards
Lydia