Difficult Dilemma Details Dodged

Greetings All; We have constructed a reservation system for a chain of travel agents. Our former PHP'er wrote the booking section but it appears to be very fragile, as it breaks regularly. We are now rewriting this section. Our problem. page 1 is a form to fill in up to 4 names so as to search the database (MySql client table) and if there shows the details on page 2. If names (some or all) are not there we need to be able to click modify and either modify information or add new client. This we have now, our problem is getting the modified/new information to move a long and redisplay page 2 with all the modified/new info. Can anyone suggest a method Thanks Kevin,