Hell no, you should not have to top up the oil between services so you have a major issue if it is empty.
Take it back to the shop and have them have a look at it for oil leaks they might have not tightend the sump nut up correctly or the oil filter was not tightend and you should have had an oil light come on by now if empty.
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04 Audi A4 B6 1.8TQ S-Line 190bhp 6 Speed Duel SMIC
Milltek Exhaust|VMR boost Gauge|SP51 K04-15 Outlaw (K04-23+)|Samco Sport DV|034 Sport CAT (15bhp over stock)|TT MAF| 380 inj| Autobahn88 TIP|
To be fitted: B7 RS4 F-Brakes|B5 RS4 R-Brakes|SB Stage4 Clutch|