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Is Mr. Tanaka available to take a call?
Around what time can I reach you by phone?
I'm calling about tomorrow's meeting.
Please connect me to Mr. Sato at extension 203.
I'm calling because I have something to confirm.
Please call me back as soon as possible.
I'm calling about the estimate.
Would you prefer email to a phone call?
I'm returning your call from earlier.
I'll call again during lunch break.
Sorry to call you when you are busy.
Thank you for your call the other day.