Depending on the situation and people you deal with, one might be either an extravert or introvert. Such people are called ambiverts. We have a few flirting tips for such individuals.
They are really helpful and can be used to break the ice whenever you go on a date.
Share your number
If the person is willing to share their number with you, appreciate that and give your cell phone number so that you could keep in touch with each other. Remember to send a message now and then.