One person is a server in a restaurant. The other person is someone who is ordering food, but isn't really sure what they want.

One person is the phone receptionist. The other person is calling to make an appointment. The appointment date they want isn't available. The soonest is 6/13

One person is a customer who wants a refund or exchange for some shoes he/she bought. The other person is the cashier. The customer doesn't have a receipt.

One person is a doctor. The other person is a patient with a stomachache, cough, and fever