Put it at the end of a waiting scene, just as the camera holds on the empty desk, then follow it with a shocked reaction when nobody appears. For a busier front desk, start with keyboard typing to show the staff are distracted, then ring the bell to interrupt them.
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This is a single, bright ding from a small metal counter bell, lasting about 1.7 seconds with a clear, ringing tone. It feels politely impatient, like a guest tapping for attention while nobody is at the desk. The sound comes from the real bells kept on hotel reception counters, diners and shop tills, where one ring is enough to ask for service without speaking.