1、Please notify me soon. 

2、Looking forward to a prompt reply. 

3、Please do not fail to write to me. 

4、I shall feel obliged by a reply at your earliest convenience. 

5、I look for your answer in a few days. 

6、Let me hear if you receive the parcel safely. 

7、As the season grows colder, I hope you will take good care of yourself. 

8、With kind regards to your family. 

9、Please give my compliments to your family.