This is called deadlock

From	To	Message
Boss	Secretary	For a week we will go abroad, so make arrangement.
Secretary	Husband	For a week my boss and I will be going abroad, you look after yourself.
Husband	Secret lover	My wife is going abroad for a week, so let’s spend the week together.
Secret lover	Small boy (whom she is giving private tuition)	I have work for a week, so you need not come for class.
Small boy	Grand-father	Grandpa, for a week I don't have class 'coz my teacher is busy. Let’s spend the week together.
Grandpa (the 1st boss ;) )	Secretary	This week I am spending my time with my grandson. We cannot attend that meeting.
Secretary	Husband	This week my boss has some work, we cancelled our trip.
Husband	Secret lover	We cannot spend this week together; my wife has cancelled her trip.
Secret lover	Small boy	This week we will have class as usual.
Small boy	Grandfather	Grandpa, my teacher said this week I have to attend class. Sorry I can't give you company.
Grandfather	Secretary	Don't worry this week we will attend that meeting, so make arrangement.