There are many ways to describe a friendly chat, depending on the tone and purpose of the conversation. Some synonyms for "hadst a friendly chat" might include "had a pleasant conversation," "enjoyed a leisurely talk," "engaged in cordial banter," "exchanged friendly words," or "shared amiable discourse." Other options could include "had a congenial discussion," "chatted affably," "conversed genially," "talked amiably," "bantered in a friendly manner," or "had a convivial exchange." Each of these phrases conveys a slightly different nuance, but they all express the idea of a relaxed and comfortable conversation between friends.