Complete the dialogue.

A: Hello. ... are you today?
B: I'm fine. ... 's the weather like today?
A: It's sunny and hot. Let's go swimming!
B: Good idea! ... can we swim?
A: There is a nice river next to the park.
B: ... can we go?
A: At 4 pm, I think.
B: Is it OK if my friend goes with us?
A: ... not? ... is your friend?
B: She's my sister, Jenny.
A: ... are we going to go to the park then?
B: On foot!