In Portuguese, people use the expressions Bom dia, Boa tarde and Boa noite both when saying hello and goodbye, as in Olá, bom dia - Hello, good morning or Adeus, boa tarde - Goodbye and good afternoon to you.
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Tipping is not mandatory, and you should only do so if you feel comfortable about it and if you want to reward truly exceptional service. Tipping for great service is very much appreciated.