Exchanging a wrong size, showing the receipt, and asking about refunds.
Calling to reach someone, asking when they return, and leaving a message.
Describing symptoms, asking for a day off, and the usual words of concern.
Buying tickets, using an IC card, express vs local trains, and changing lines.
How to ask the way to the station or post office and follow the directions.
A short chat about the weather - the classic Japanese conversation starter.