Telephoning
Answering
Good morning/afternoon
This is... / ... speaking
How can I help you?
Making an appointment
When would be possible/convenient for you?
What time could we meet/are you free?
When would you like to meet?
Changing a meeting
I'm sorry, I have to cancel the appointment on...
Could we arrange another time?
I'm afraid I can´t manage our meeting
Calling
Good morning this is...
I'm calling to...
Could I speak to...?
I would like to speak to...?
Leaving a message
Would you like to leave a message?
Could I leave a message?
Could you tell ... that I called?