If interviewer called you at a once, and you were not ready to interview, you may say:
A、I am sorry. I didn’t get your name. Could you repeat it, please?
B、I’m glad you called, but I have the class at 2 p.m. Could we arrange another time to speak?
C、I am sorry we seem to have a bad connection. Could you speak a little louder?
D、Could you please slow down just a little bit?