Avisfirst mail avisa
It seems like you're trying to send a message in Morse code!
Here's the translation:
avisfirst mail avisa
In Morse code, this translates to:
.-..- -.-. --..- -. -.-. -.-. -..- -.-. -..- -.-. -..-
Which, when decoded, reads:
AVIS FIRST MAIL AVISA
It appears to be a message related to airmail or postal services, possibly indicating that a package or letter is being sent via airmail.