There are many ways to respond to someone who says "thank you," depending on the situation and your personal style. Here are some common responses:

• "Youre welcome." This is the most common response and is appropriate in most situations.
• "My pleasure." This response emphasizes that you were happy to help or do something for the person.
• "No problem." This response emphasizes that what you did was not inconvenient for you.
• "No worries." This is similar to "no problem" and is a more informal response.
• "Dont mention it." This response is often used after someone thanks you for something small.
• "Anytime." This response communicates that you are willing to help in the future as well.
• "It was the least I could do." This response is often used in a situation when the problem was big, and you did something small to assist.
• "Glad to help." This response emphasizes that you are happy to assist.
• "Sure!" This response is informal.
• "Thank you." This is a viable option when you also have something to thank the other person for.

Remember that the best response depends on the situation and your personal style.