I am new to supply teaching and have worked for single days and one block of 4 weeks. Is it ever acceptable to cancel a booking? When I cancelled a day booking to accept the block booking, Agency XYZ were fine with it and wished me all the best. However this week I agreed a one day booking but was then offered a two day booking and so cancelled the original one. The reason of course, was money. Plain and simple. However this agency were really peeved and told me that they will think twice before offering me any more work. I suppose I can understand their thinking and perhaps I was being selfish. What does anyone else think?