根据句意或汉语提示补全对话。
Mike: What's ?
John: My father is (生病). He should see a (医生). So I can't go to the zoo with today.
Mike: I'm sorry to hear that. Don't be ( 担忧). We can go next time.
John: Thank you.
Mike: How does your Dad (感觉)now?
John: Not well. Let's go to the hospital.