Here are some possible responses to the prompt "Hannah?":
1. "Yes, that's me. How may I help you?"
2. "Hannah? Oh, you mean me! What do you need?"
3. "Do you need something, Hannah?"
4. "Hannah speaking. What can I do for you?"
5. "Hey, it's Hannah here! What's up?"
6. "Hannah? That's me! What's on your mind?"
7. "Is this Hannah you're looking for? If so, I'm here!"