The only cure is rest. Antibiotics don't work because these are viruses and cold medicines help with symptoms so you feel a bit better but rest is really the only cure.
Your tone of voice should be friendly, professional, and sincere to keep a patient engaged. Improving your tone can be as simple as smiling, taking a deep breath, and approaching with a genuine desire to help.
True, For example you have to eat healthy and not do drugs in order to function correctly and not be affected by these things