Hi Tower i'm Dave.
Hi Dave, what do you want?
Oh well.. i want a FIS
Ok, pass your details
But that's not a realistic sequence. It should be:
Hi Tower i'm Dave.
Hi Dave, what do you want?
Here are my details and I'd like an FIS please
which differs only superficially from your
Hi Tower i'm Dave and I'd like an FIS please.
Hi Dave, what do you want?
Here are my details
If it's going to require further exchanges anyway, it doesn't make any difference.
If the request is short and standard, sure, pass it in the initial call. Sometimes it can help the ground station to pick up the right piece of paper or even expect the right pattern of words. But the Tower can probably anticipate that you're going to ask for FIS rather than a bacon sandwich.
If the request is non-standard, or long and complex, then there's not much point in confusing the controller. It works both ways. Even after communication has been established, I'd prefer a "G-ABCD, Stephenville" to pre-warn me of a non-standard message or request that might need a pen and paper. Conversely, you'll also frequently hear those professional pilots on the control frequencies saying "Stephenville G-ABCD request" to pre-warn the controller of a non-standard request which would undoubtedly lead to a "say again" if it came unannounced.