How to create a function that checks dates using a boolean value

I need to create a function that will:
  1) return a Boolean true/false.
  2) the function should receive a slip_num, arrive_date, depart_date as parameters.
  3) if the slip is available during the duration of the arrive date to depart date, the function  
       should return true. Otherwise it should return false.
curiouspersonAsked:
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flow01Commented:
create or replace function slip_available(slip_num number, arrive_date date, depart_date) return boolean
is
  v_return boolean := false;
begin
    if  ,,,  then
      v_return := true;
    end if;
   return v_return;
end;
/

note :
you can use this function in pl/sql but not in sql
in sql-statements booleans can't be used

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curiouspersonAuthor Commented:
What does the v stand for in v_return?
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flow01Commented:
in our company we use it the recognize variables in the source
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flow01Commented:
i keep the habit (partially) on expert_exchange
otherwise a shoud have defined also
create or replace function slip_available(p_slip_num number, p_arrive_date date, p_depart_date) return

where p_ refers to parameters (= arguments)
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