a little too friendly abby. just say this, " hi, you have reached abby. i am unable to answer your call right now, but if you leave me your name and phone number, i will get back to you as soon as possible. thanks ".
ok, so how about this, " this is abby and i am really happy you called! i promise i will give you a ring as soon as i can, so please leave me your name and number. talk to you soon! ".