callback( { "result":{ "query":"Back* off* action* selection* in* summary* space* based* POMDP* dialogue* systems*", "status":{ "@code":"200", "text":"OK" }, "time":{ "@unit":"msecs", "text":"0.87" }, "completions":{ "@total":"0", "@computed":"0", "@sent":"0" }, "hits":{ "@total":"0", "@computed":"0", "@sent":"0", "@first":"0"} } } )