"Hi Anna, how are you? Would it be possible to do our Parkrun Cup race this Saturday? I'm sorry to ask, but I'm on holiday and working away for the other weekends. If you can't, don't worry, as it's me that can't do 2/3 races then you should go…"

"Hi Graham, how are you? We've been drawn against each other in Round 2 or the Parkrun Cup. Would it be possible to do this weekend? Just because I'm meant to be away for Easter and then I'm doing London Marathon on the 28th. If not, I'm sure we can…"