"Do you think you could check me for strep throat?"
"Does your throat hurt?"
"No, but I usually get strep throat around this time of year."
"Do you feel sick?"
"No, but I figure it would be better if I didn't wait until I'm sick before I try and treat it."
"If you don't have any symptoms, there's nothing to treat."
"But what if I'm sick and just don't know it yet?"
"Then you should come back once you're feeling symptoms, and then we can figure out what's wrong and treat it."
"So I have to come back? When should I come back?"
"When you're sick."
"Like in two weeks?"
"No. When you're sick."
"Can I make an appointment?"
"Call when you're sick."
"But you can't give me anything now?"
"No, you're not sick."
"I don't know if I think that makes sense."