Time for a response on a messaging application

Below is a table schema for a P2P messaging application. The table contains send/receive message data for the application's users.

Column Name	Data Type	Description
date	string	date of the message sent/received, format is 'YYYY-mm-dd'
timestamp	integer	timestamp of the message sent/received, epoch seconds
sender_id	integer	id of the message sender
receiver_id	integer	id of the message receiver

Questions

Using Python and the Pandas library, how would you find the fraction of messages that get a response within 5 minutes?

For simplicity, let's limit data to March 1, 2018.