This is salesforce console (chat ) lighting application

I am trying to send auto greetings along with 3 other texts when chat is initiated and accepted the member should get the auto greeeting as if sent by agent do you have any api's i tried with SendMessage(), conversation toolkit api but when agent is typing something the messages are firing and taking long to auto fire like 2min around but they should fire immidiately when chat is initiated according to the requirement out of 3 messages 1st meaasage is welcome message which comes from chat button next two are like pre flight question and note for do not refresh i think we cant send all messages from one chat button right we used [login to view URL] message and send those 2 in classic this we want it to replicate in lighting application .. that event related to that method of classic send message its not firing properly DO you have any idea regarding this ??