An appropriate response to a wedding guest who mentions that they can't stay for the entire reception due to work in the morning should be understanding and appreciative of their presence. Here's a polite response:
"Thank you so much for coming to our wedding! We completely understand that you have work in the morning, and we appreciate you taking the time to celebrate with us tonight. Your presence means a lot to us, and we hope you enjoy the time you can spend with us. Have a safe journey back, and we look forward to catching up soon!"
By responding in this way, you acknowledge the guest's commitment to attending your special day despite their work obligations. You also express gratitude for their presence, making them feel valued and appreciated. Remember, it's essential to be gracious and understanding, as everyone has different commitments and responsibilities to attend to.