pd.set_option('display.max_colwidth', -1)
df = pd.DataFrame({'query': query_data_train, 'intent': intent_data_train, 'slot filling': slot_data_train})

df_small = pd.DataFrame(columns=['query','intent','slot filling'])
j = 0
for i in df.intent.unique():
  df_small.loc[j] = df[df.intent==i].iloc[0]
  j = j+1

df_small