根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯，完整.

A: Good morning. Doctor Wang.

B: Good morning, young man. ?

A: I feel terrible. I have a headache and often cough.

B: ?

A: About 2 days

B: Don't worry. Let me have a check. (A few minutes later)

A: ?

B: No, it's not serious. You just have a cold.

A: ?

B: You should drink more water and have a good rest. Remember to take the medicine three times a day.

A: I will. Thank you!

B: .