Hello Otto. I'd be amused by this sign and take it to mean that only very rude people were allowed to sit in the chairs. If I were you I'd say rather: the seats are reserved for customers waiting for a haircut.
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fivejedjonNo it isn't. You don't need any other word than 'customers'. People accompanying them are not customers.You might wish to give priority to people who are waiting for haircuts, over people who just want to sit down and read the paper after having had their hair cut.