Reply message component makes you to reply the selected message for one to one chat messages.
If you want to reply message from a single message then you click arrow menu from right corner of the message.
After choose reply option from the menu then popup window will shown below to confirm the user's message.
Type a reply message in the input box and click the send button to reply the message.
After successfully send the reply message the UI will look like this for sender and receiver end.