"no worries", "ok, no problem", "ah, thanks anyway" in Japanese
I'm wondering what sentence we should use for those moments in time where in English we would say "no worries", "ok, no problem", "ah, thanks anyway".
For example, if i go to a shop and ask if they have any pens to which the response is negative, they don't have any. At this point in time i naturally want to say one of the three sentence i just mentioned.
What is the Japanese equivalent if there is one?