Note: Each and every chat message can be replied back with the message encapsulated to it.
On the user chat window, long press on the sent or received chat message.
A message selection-copy window is opened, as shown below.
Click as directed by the arrow as shown in the figure below.
The message which you have selected to send a reply for, has been encapsulated.
Type your reply in the chat type area as shown from the figure below.
Note1: When a reply has been made to the received chat message, you can find the sender's name in the encapsulated message, as directed by the arrow from figure below:
Note2: When a sent chat message is being replied, the message gets encapsulated with the denotation "Me", as shown in the figure below.