Gant Chart

Halo,

I am using Gantt Chart as a weekly planner for all my colleagues . Users day is seperated in two parts  morning part and lunch part  . It seems like i can't achieve that with the normal Gantt Chart . What i have been thinking is : "Is it possible to change the color of the chart after the"Completion" part ?  So i put the planner for one day , i put the completion to 1 as fully completed and then i change the color under the completion line to where the user is or what he is doing " 

I really hope this is possible . Will be waiting for your response . 

Thank you in advance !