2
1 call start
1 return
2 call start
2 return
1 call addFlight xid "347" 100 310 
1 return true 
2 call addRooms xid "Stanford" 200 150 
2 return true 
1 call addCars xid "SFO" 300 30 
1 return true 
2 call commit xid
2 return true
1 call commit xid
1 return true
1 call start
1 return
1 call queryFlight xid "347"
1 return 100
1 call queryFlightPrice xid "347"
1 return 310
1 call queryRooms xid "Stanford"
1 return 200
1 call queryRoomsPrice xid "Stanford"
1 return 150
1 call queryCars xid "SFO"
1 return 300
1 call queryCarsPrice xid "SFO"
1 return 30
1 exit
