Colleague Send (From John): Meeting on Tuesday, please all ack
ColleagueB David received from John: Meeting on Tuesday, please all ack
Colleague Lucy received from John: Meeting on Tuesday, please all ack

Colleague Send (From David): Ack
Colleague John received from David: Ack
Colleague Lucy received from David: Ack

Colleague Send (From John): Still awaiting some Acks
Colleague Lucy received from John: Still awaiting some Acks

Colleague Send (From Lucy): Ack
Colleague John received from Lucy: Ack

Colleague Send (From John): Thanks all
Colleague Lucy received from John: Thanks all
ColleagueB David received from John: Thanks all