Conversations Report Help

Conversations Report Help

I need help to modify the query I have to get a report showing all conversations for only Open requests.  Right now, the report shows conversations for all tickets, and the report times out when I try to run it.

SELECT wo.WORKORDERID "Request ID",
aau.FIRST_NAME "Requester",
wo.TITLE "Subject",
ti.FIRST_NAME "Technician",
longtodate(wo.CREATEDTIME) "Created Time",
longtodate(c.createdtime)"Last conversation time/date" ,
cond.description "conversation Description",
std.STATUSNAME "Request Status" FROM WorkOrder wo
LEFT JOIN SDUser sdu ON wo.REQUESTERID=sdu.USERID
LEFT JOIN AaaUser aau ON sdu.USERID=aau.USER_ID
LEFT JOIN WorkOrderStates wos ON wo.WORKORDERID=wos.WORKORDERID
LEFT JOIN SDUser td ON wos.OWNERID=td.USERID
LEFT JOIN AaaUser ti ON td.USERID=ti.USER_ID
LEFT JOIN StatusDefinition std ON wos.STATUSID=std.STATUSID
left join conversation c on wo.workorderid=c.workorderid
LEFT JOIN conversationdescription cond ON cond.CONVERSATIONID= c.CONVERSATIONID
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