instant connection and delay reply

hihi, there. though IM is convenient, but can u feel one's motion behind chat window? no, u can't. There is always options u can choose. Reply message? Delay reply message? Type some message and delete those words? No matter how u react, it will gonna make the person wait at another peer wonder what will be ur reply. Maybe next time pop up a chat dialogue window, give a smile face first. And don't delay reply. Or u can just tell that friend u r busy and don't want to reply.