PL/SQL :: Dropping Partition Dynamically In Interval Partitioning

I have created an Interval Partition Table as show below, Is their any way, i can drop the partition dynamically when i truncate the table as oracle creates them with system generated name? Instead Alter table drop partition !

Create Table Script :
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CREATE TABLE TBL_EMP_SALES
(
EMP_ID NUMBER(38),
EMPNAME VARCHAR2(9),
EMP_SALES_AMOUNT NUMBER(5),
EMP_SALES_DATE DATE,

[Code]....

Insert Script :
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INSERT INTO TBL_EMP_SALES VALUES (1001,'A',50,SYSDATE);
INSERT INTO TBL_EMP_SALES VALUES (1002,'B',100,SYSDATE+1);
INSERT INTO TBL_EMP_SALES VALUES (1003,'C',80,SYSDATE+2);

[Code]....

Partitions Created :
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select segment_name,partition_name,bytes from user_segments where segment_name = 'TBL_EMP_SALES';
segment_name partition_name bytes

TBL_EMP_SALES     P0     8388608
TBL_EMP_SALES     SYS_P602     8388608
TBL_EMP_SALES     SYS_P603     8388608

[Code]....