Well, some men may be nervous when they start chatting, and then they don't know what to say. Generally speaking, they may mean that you are there, what are you busy with, have you eaten? These simple words are very common.
Here is a recommendation for you. For example, you can send a funny expression when chatting. Girls may be very happy after seeing it, so the topic naturally begins. Then you can also send the songs you like to listen to to to girls. Find some topics from some details, and we can talk slowly. Just like friends.