轉英文"天氣轉冷，小心著涼, 如有需要可向我們索取厚棉被"

The weather transfers coldly, carefully catches cold, if has the need to be possible to demand the thick cotton-wadded quilt to us

The above translations are fine (some with grammatical mistakes) but you really do not have to use a lot of words to convey the message.

It is getting cold. Keep yourself warm. Please contact us for quilt/blankets if needed.

The weather is getting cold, dress warmly.
If anyone needs to have blankets, please feel free to contact me/us

Hehehaha 1977 2003嘅答案較好, 不過我覺得咁寫會好D:

The weather is getting cold, beware of catching cold, please come to collect a heavy cotton quilt if neccessary.

The weather was changing cold, please take care yourself that it is easy to catch cold. You can ask us for some cotton quilt if there in need