Which word would be an antonym for “maybe”?

Context: Anny and Lizzie are two friends who study at NY University. There'll be a long holiday and they are trying to decide what to do. Anny is American, Lizzie is British and both of them love to make fun of each other's accent.

Read the dialogue below and answer the question.

- What are you up to this weekend?

- I've got no idea, actually… What about you? Maybe football?

- No, no. Soccer is not my thing. Maybe… dancing?

- I'm keen to dance. Why not?

- Alright, let's call Martha and Susie. Maybe they wanna join us.

- Absolutely.