public ConversationStarter(LocalUser user, ConversationStartDelegate conversationStartResult) : this(user.PrivateKey, conversationStartResult)
 {
 }
 public ConversationStarter(string privateKey, ConversationStartDelegate conversationStartResult) : this(privateKey)
 {
     ConversationStartResult = conversationStartResult;
 }
 public ConversationStarter(ConversationStartDelegate conversationStartResult) : this("", conversationStartResult)
 {
 }