[{"role": "user", "content": "I'm trying to learn some Italian phrases for my upcoming trip, and I'd like to know how to tell a friend to stop complaining - how do I say 'Stop grumbling' in Italian?"}, {"role": "assistant", "content": "You can say 'Smettetela di lamentarvi.' to tell a friend to stop grumbling. This is a friendly way to tell someone to stop complaining. Buon viaggio (have a good trip)!"}]