His thanks

of his or her own accord; with his or her good will; voluntary.

See also: thank

References in classic literature ?
Collins, and as they walked down the garden he was commissioning her with his best respects to all her family, not forgetting his thanks for the kindness he had received at Longbourn in the winter, and his compliments to Mr.
The knight was sorrowful no longer; yet he could hardly voice his thanks through his broken utterance.