You will be able to search for your contact list here
You will be able to filter out the contacts using tags, message sent and message received here。
At the search bar you may search for the contact number using name or phone number or tags
You can click on the + button to add a tag on your selected contact number
Step 1: Click on the top right corner「+」,and click 「Tag by Message History」
Step 2: select the keyword that you would like to filter out and select the date you may include rules example :
Condtions:All messages, or messages sent by me, or messages received