That's a great idea.

Of course

you have a point there

I'm sorry but

I think so too

based on the text

Bea: Today is a great day for an adventure.
Lea: Yes, (20) ___________.
We need to pack some food.

Bea: (21) ___________.
We need a medicine kit too in case of emergency.

Lea: (22) ____________.
Can I bring my cat along?
Bea: (23) ___________. I don't think that's a good idea. It might get astray.
Lea: (24)Yeah, ____________. ​