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import boto3


def get_available_regions(service_name):
    """Returns list of available regions given an AWS service.

    Args: service_name

    Return: list of available regions for the given AWS service
            Example: ['ap-northeast-1', 'ap-northeast-2', 'ap-south-1',
            'ap-southeast-1', 'ap-southeast-2','ca-central-1', 'eu-central-1',
            'eu-west-1', 'eu-west-2', 'eu-west-3', 'sa-east-1', 'us-east-1',
            'us-east-2', 'us-west-1', 'us-west-2']
    """
    session = boto3.session.Session()
    return session.get_available_regions(service_name)