how to reply someone who only reply u with "hahaha". [lihui u must see properly ok]

Frederick- sho moody :( says (11:28 PM):*
chio lan la chio
ccb you reply me with haha how i reply you?
you know haha very hard to reply one or not?
you try talking to me seriously, i haha you back la ccb see how you reply

now i know what to reply....