formal phone call - urgent, please!

[lazybear]

I have to make a formal (business) phone call. How do I ask politely who am I talking to (I don't remember the person's name)?

Thanks a lot!

[BobK]

Is it someone you've met before? In that case, you could say 'Sorry, I've forgotten your name. Who is it I'm talking to again?' Or - depending on the level of formality (this is pretty colloquial) - instead of the first sentence you could say 'Sorry, I've got a memory like a sieve.'

b