Could you please help me to revise the following short email?
Thank you for the lovely card and friendly letter.
It's very pity that my son cannot be with another great friend in the child care. (Darby+Fraser)
I would very happy if they played together. We don't have any plan for the holiday so feel free to organise a play date. It can be in our or your place, a swimming pool or a park ....
Happy new year,