The coach was too busy to attend to the last message. The coach is busy at work and has no time to chat with you. He can only reply to your message when he is free. Coach doesn't want to return your message. On the whole, your requirements may be a little high. He can't answer at the moment, and he can't meet your requirements. He's a little embarrassed. He will think about it and won't reply to your message for the time being.