[Python] Cannot reset_index inplace on a Series to create a DataFrame

When I am trying to reset the index of my dataFrame, it is not working.

new = pd.DataFrame(columns=['a','b','Amount1'])
new['Amount1'] = [0,1,6,7,8,9]
new['a'] = ['sarim',1,2,3,4,'sarim']


df_tf = new[new['a']=='sarim']['Amount1']
df_tf.reset_index(inplace=True)

ret_df['Amount1'] = df_tf

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