/// <summary>
/// Expand a template with given name and scope.
/// Return all possible responses instead of random one.
/// </summary>
/// <param name="templateName">Template name to be evaluated.</param>
/// <param name="scope">The state visible in the evaluation.</param>
/// <returns>Expand result.</returns>
public List <string> ExpandTemplate(string templateName, object scope = null)
{
var expander = new Expander(Templates, this.expressionEngine);
return(expander.EvaluateTemplate(templateName, scope));
}