Please find out first_name about a person, please remember that first name is the first name of a person
example:
    Input: '''NAME_1 and NAME_2 are friends'''
    Ourput: {"first_name": "NAME_1"}, {"first_name": "NAME_2"}
Please give me the Output based on below Input
    '''
    My name is NAME_3.
    My sister's name is NAME_4.
    My brother's name NAME_5. My dog's name is NAME_6
    ''' The word "name_3" should not appear in your response.
user