Dont initiate a date

Some guys get carried away at the success they had with the initial conversation and end up asking the girl out for a coffee or lunch. Dont do that, it would mostly be a no from her side and things might get uncomfortable. Remember that you need to make her feel completely comfortable. You can ask her where she lives, you can ask her about where she works or stuff like that, if a girl is comfortable in your company she wouldnt mind revealing personal information. Make sure you ask all this very casually, it should not come off as an inquiry that might get her wary. Say something like "so you live nearby" (almost like statement rather than a question) or "travelling is getting tough for me" (this will get her to talk about her mode of transportation). Be subtle, never be too obvious. You can get her number or chat id (its popular nowadays) on the pretext catching up, for example you can say something like "whats your number, i'd like to catch with you sometime". Be relaxed and confident in this approach, no sly smile, no signs of discomfort. Anything which gets alarms ringing in head is bad for you, she should feel that she is in no danger by giving you her number. A chesire cat smile while asking for her number will immediately creep her and she will have second thoughts about it (she might just give you a wrong number). Also remember to avoid the "Can I have .." approach. Never say something like "can i have your number?", its a got a needy pleading tone to it. Just ask for it "whats your number". Girls like guys who are bold enough to ask for what they want, the best thing is they usually give it. Girls have a giving mentality, you just need to approach her right.