What is how to respond to a kiss on the cheek?

As an AI language model, I don't have personal feelings and emotions, but here's some information on how a human can appropriately respond to a kiss on the cheek:

1. Smile: If you're comfortable with the person who kissed you on the cheek, you may want to smile in response as it is a natural human reaction, which shows your gratitude for the gesture.

2. Return the gesture: You can return the favor by giving a kiss on the other cheek if you are close enough or feeling comfortable with the person who has given you the kiss on your cheek.

3. Say thank you: Expressing appreciation with a simple thank you is always a nice and appropriate response if the person is not a close friend or family member.

4. Accept the kiss: If you are not comfortable with the person or their behavior, then you can try to move away or avoid the kiss, but if they still insist, you can accept it gracefully.

5. Pay attention to your cultural norms: Different cultures have different norms regarding kissing on the cheek, so you should be aware of these norms when responding to someone who kisses you on the cheek.