Discord modmail bot help

i am making a discord bot that when you react to a message it makes a channel so when i send a message in that channel the bot made, the bot dms that message (that i said in the channel) to the person who reacted to it. i have so far that when a person reacts to the message the bot dms them a noti saying they reacted and a channel is made. any command so when i enter a message in that channel the bot sends the user what i said?