When you receive a gift or a tip from a customer, it's always nice to show your appreciation and gratitude. A good way to do this is by saying "Thank you very much!" or "I really appreciate it." If you'd like to go the extra mile, you can also express your gratitude by offering your customer a little something in return. For example, you could offer a discount on their next appointment or give them a small gift as a way of saying "Thank you for choosing me as your hairdresser."