All cancellations and requests for refunds must be addressed in writing and mailed to CE Tours, PO BOX 423, Allen, TX 75013 . Please include the students name, Tour ID number, and complete address. The refund process takes approximately four to six weeks.   Please note that all private group tour prices are based strictly on a minimum quoted number of participants.  If a cancellation causes your groups total number of participants to fall below that minimum, the price of the tour for the remaining students is subject to increase.