What do these errors mean and how do you suggest I fix them? - oracle

Question

I am new to learning SQL and currently learning it in class. I am trying to write a code that fulfills the following requirements:
Make a reservation: Input parameters: Hotel, guest’s name, start date, end dates, room type, date of reservation. Output: reservation ID. NOTE: Only one guest per reservation. However, the same guest can make multiple reservations.
Find a reservation: Input is the guest’s name and date, hotel ID. The output is reservation ID
I am still somewhat new to deciphering error codes and tried to look up what they mean. However, I'm still not quite sure why my code is wrong.
CREATE OR REPLACE PACKAGE hotelmanagement AS
FUNCTION make(rsrv_id VARCHAR2
,hotel_name VARCHAR2
,guest VARCHAR2
,start_date VARCHAR2
,end_date VARCHAR2
,room_type VARCHAR2
,rsrv_date VARCHAR2)
RETURN NUMBER IS
rsrv_id NUMBER;
BEGIN
SELECT rsrv_seq.nextval INTO reserve_id FROM dual;
INSERT INTO reservations
VALUES
(reserve_id, 'Four Seasons', 'Amanda', 'July-30-2019', 'Aug-8-2019',
'King', 'July-18-2019');
tot_rsrv := tot_rsrv + 1;
RETURN(rsrv_id);
END;
FUNCTION find(guest VARCHAR2
,rsrv_date VARCHAR2)
RETURN NUMBER IS
rsrv_id NUMBER;
BEGIN
SELECT rsrv_id
INTO guest
FROM reservations
WHERE rsrv_date = find_rsrv_date;
END;
RETURN(rsrv_id);
END hotelmanagement;
I have these error messages(two of them look the same?):
Error(4,1): PLS-00103: Encountered the symbol "SELECT" when expecting one of the following: begin function pragma procedure subtype type current cursor delete exists prior The symbol "begin" was substituted for "SELECT" to continue.
Error(5,1): PLS-00103: Encountered the symbol "RSRV_ID" when expecting one of the following: language
Error(5,1): PLS-00103: Encountered the symbol "RSRV_ID" when expecting one of the following: language

Answer 1

The requirements are a quite vague, so it is difficult to provide the desired procedure. Anyway, your code has some weak items.
Your procedure has several input parameters but you don't use them inside the procedure.
Use appropriate data types, i.e. never(!) store DATE or number values in string, i.e. VARCHAR2. Use VARCHAR2 only for string data. At least you use four digit year, which is the proper way of doing it.
RETURN command does not use brackets.
Taking all this into account your code should be more or less like this:
CREATE OR REPLACE PACKAGE BODY hotelmanagement AS
FUNCTION make( -- you can't declare variable "rsrv_id" twice
hotel_name IN VARCHAR2
,guest IN VARCHAR2
,start_date IN DATE
,end_date IN DATE
,room_type IN VARCHAR2
,rsrv_date IN DATE)
RETURN NUMBER IS
rsrv_id NUMBER;
BEGIN
INSERT INTO reservations
VALUES
(rsrv_seq.nextval, hotel_name, guest, start_date, end_date,
room_type, rsrv_date)
RETURNING reserve_id INTO rsrv_id ;
-- tot_rsrv := tot_rsrv + 1; -> I don't see any use for it, variable tot_rsrv is not declared
RETURN rsrv_id;
END;
FUNCTION find(v_guest IN VARCHAR2
,rsrv_date IN DATE) RETURN NUMBER IS
rsrv_id NUMBER;
BEGIN
SELECT rsrv_id
INTO rsrv_id
FROM reservations
WHERE rsrv_date = find_rsrv_date
and guest = v_guest; -- don't use "guest = guest" because this will select all rows.
RETURN rsrv_id;
END;
END hotelmanagement;