SELECT Operation with SNAPSHOT ISOLATION failed due to REBUILD INDEX and UPDATE STATISTICS job at sametime, On week-End

Hi,We have used "SNAPSHOT ISOLATION LEVEL" and we have REBUILD INDEX and UPDATE STATISTICS job on week-end but our "SELECT" (that only get the data) Stored procedure get failed due to "SNAPSHOT ISOLATION LEVEL" and parallelly REBUILD INDEX and UPDATE STATISTICS job.Our database server is in UK (UK timezone) and users uses the application from India, Singpore and UKso we dont have any specific time to decide when we have to execute the maintenance job.Please suggest me possible ways to avoid this situation ? ThanksChandresh Patel