only starting out so not down with all the lingo just have a question about an issue that has popped up.

when chatting to a girl on facebook/tinder/whatsapp etc. ive done the reccommended thing and only sent 2/3 messages before asking for the number.

when they respond and gloss over the number part (but are still flirty) should i ask for the number again in a couple more texts, act less interested or what? would you guys reccommend?