def get_plot_of_confidence_intervals_labels(time_type):
    """Get graph labels

    Parameters
    ----------
    time_type : string
        A string to distinguish between times in order to adjust labels

    Returns
    -------
    string, string, string
        three strings that represent the graph's title, x-axis label and
        y-axis label
    """
    if time_type == "w":
        title = "Mean Waiting time over number of iterations"
    elif time_type == "s":
        title = "Mean Service time over number of iterations"
    elif time_type == "b":
        title = "Mean time Blocked over number of iterations"
    else:
        title = " "

    x_axis = "Number of trials"
    y_axis = "Means of times"

    return title, x_axis, y_axis