2 Alton towers tickets for 1st May and 2x for the 7th May swap?? *

I have 2 Alton towers tickets for the 1st May 2012 and 2x tickets for the 7th May 2012. I would like to swap them dates for tickets for the 29th April 2012 as thats the date were going. If anyone has any for the 29th April and are selling them and dont want to swap we will buy. Thanks