Sorry, boys are texting girls. Will the other party send it again if it doesn't reply?

If I don't reply to any of them, here's the situation.

First: no hurry.

Then, just wait a few hours and send another one to the other party. If you don't reply, you won't continue.

Second: urgency.

Then, don't reply to the text message, just call the other party directly. If you don't return phone calls and text messages, then don't continue.