View with consoildatet rows

Hi all
Hope you can help a beginner with this
I have 2 tables like this:
ASSIGNMENTS
emp number(9)
startdate date
dep varchar2(3)
enddate date
arr varchar2(3)
BASE
emp
station varchar2(3)
TABLE ASSIGMENTS
1 01-DEC-03 LAX 01-DEC-03 JFK
1 02-DEC-03 JFK 03-DEC-03 LHR
1 04-DEC-03 LHR 05-DEC-03 LAX
1 06-DEC-03 LAX 06-DEC-03 SFO
1 07-DEC-03 SFO 07-DEC-03 SFO
TABLE BASE
1 LAX
Then I want to produce a query that gives me a "time away from base" row
Wanted result:
1 01-DEC-03 05-DEC-03
1 06-DEC-03 07-DEC-03

Just a correction:
Arr in the last row off the assignment table shall be LAX

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