Guys, how would you handle this?

Let's say a girl that you know has a crush on you , asks you out, casualy for a cup of coffee. You don't want to pursue a romantic relationship with her but you appreciate her as a person. You are not close friends either. What do you say? Do you say yes to not let her down? Or do you say no to not make her get her hopes up?

Guys, how would you handle this?
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