Hi, would love to see...

1. From the main screen of all threads,
   search for persons name as a contact and listed first, not most recent conversation with anyone including that persons name as a keyword listed first.

2. Search within one conversation of a specific keyword.

So, from the main screen tapping the search bar gives two options...
1. Global keyword
2. Contact

then when tapping a conversation with a contact,
The search button functions as a keyword search.