How to use output of one query into another query in python/ sql?

Question

I have one query which is like:

        q = f"""
                select distinct
                    s.user_id
                    ,d.prime_tagging_by_issuer_and_product
                from sms_callback_events s
                    inner join {table} d
                    on s.user_id = d.user_id
                    where event_name = 'event_1'
                    and d.user_id is not null and d.user_id != ''
            """
        with redshift_direct() as conn:
            sms_df = pd.read_sql(q, conn)

Now I want to discard only those user_ids which were selected in this query and pass rest of the user Id's to my another query which is also similar

 q = f"""
                    select distinct
                        s.user_id
                        ,d.prime_tagging_by_issuer_and_product
                    from flash_events s
                        inner join {table} d
                        on s.user_id = d.user_id
                        where event_name = 'event_1'
                        and d.user_id is not null and d.user_id != ''
                """
            with redshift_direct() as conn:
                flash_df = pd.read_sql(q, conn) 

here {table} is nothing but a dataframe of user_ids and plus some other columns.

How do I achieve this? How do I put a condition where I dont pass the user ids from sms_df to my next query?

Any help is appreciated.