How to find free space in a Tablespace?

Hi,
I have a limited access to objects in my database ( do not have access to many tables).
I have been allocated 300GB of size in my tablespace which allows me to create my objects.
Now, I want to find out how much of this tablespace size allocated to me have been used up. I do not have access to dba_data_files or dba_segments.
Is there a way out for me? Could anyone show me a way please?

This query will give you the required information but it makes use of DBA tables.
SELECT B.TABLESPACE_NAME, TBS_SIZE SIZEGB, A.FREE_SPACE FREEGB
from  (select tablespace_name, round(sum(bytes)/1024/1024/1024 ,2) as free_space
       from dba_free_space
       GROUP BY TABLESPACE_NAME) A,
      (select tablespace_name, sum(bytes)/1024/1024/1024 as tbs_size
       from dba_data_files
       group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name;
However, you said that you are aware of your tablespace details so the above query can be modified to get the free space in your tablespace. Now I am using user_frees_space and not dba_free_space. Generally user* tables are and should be made accessible to the users.
select  tablespace_name, round(sum(bytes)/1024/1024/1024 ,2) as free_space
from    user_free_space
where   tablespace_name = 'Your tablespace name'
GROUP BY TABLESPACE_NAME;
Ishan

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              v_free_space := v_total_space - v_space_used;          
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