how to send a message to a certain user discord.py code example

Example 1: send message discord.py

await message.channel.send("Your message")

Example 2: store message sent by user in string discord py

response = client.wait_for_message(author=ctx.message.author, timeout=30) 
myvar = response.content  

Make sure to Define ctx and message if you want it to be controlled by a command