Question

How does Hannah contact Alia? Is there anybody

Answer 1

Caroline was introducing Hannah to Alia.

note the second paragraph of the e-mail sent by Hannah:

Hello, Alia! Let me introduce myself. My name is Hannah.

I know your name from my friend, Caroline. She told me that you sent her an email telling her that you would like to have more from the US pen. I really like to be your E-pal. You sound really cool!

here Hannah found out Alia's name from Hannah's friend named Caroline. Caroline tells Hanna that Alia sent an email to Caroline telling Alia that she wanted more pen friends from the United States. Hannah is eager to be Alia's electronic friend.