And is used in conversational English when the person who is listening is expecting the other person to say more, as in your case and in the following one.

A: I saw Michelle.
B: And?
A: She said she misses you and she feels stupid for what she did.
B: She could have thought of that before doing it.
A: Yes, but she is really sorry.

And is used in conversational English when the person who is listening is expecting the other person to say more, as in your case and in the following one.

A: I saw Michelle.
B: And?
A: She said she misses you and she feels stupid for what she did.
B: She could have thought of that before doing what she did.
A: Yes, but she is really sorry.