def get_dhl_tweet(df, dhl_acc):
    """
    Get Tweets by DHL associated accounts

    Parameters
    ----------
    df : pandas.core.frame.DataFrame
        Tweets data.
    dhl_acc : list
        List of Twitter account usernames associated with DHL.

    Returns
    -------
    pandas.core.frame.DataFrame
        Filtered dataframe containing only Tweets by DHL associated accounts.

    """
    return df[df['username'].isin(dhl_acc)].reset_index(drop=True)