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def add_new_chat_session (self, client: Client, agent: Agent) -> datetime:
    ''' Creates a new chat session between the given client and agent; Returns the unique starting timestamp for that session
        This function doesn't handle the communication for the chat session. The controller should do this.'''
    pass

def log_message (self, session_timestamp: datetime, sendor_name: str, message: str) -> None:
    ''' Records the message to the chat session with the associated timestamp '''
    pass

def end_chat_session (self, session_timestamp: datetime) -> None:
    ''' Ends the chat session with the associated timestamp. 
        This function just marks the session as being inactive, 
        which could be used by the controller to determine which session's communication should cease '''
    pass