A321 Captain reported being notified by the flight attendants of a fumes event during initial climb which dissipated shortly thereafter. After conferring with flight attendants; the flight continued to destination where a logbook discrepancy and fumes report was submitted.

Narrative

After departing ZZZ and in the initial climb (somewhere around 18k); the #4 FA (Flight Attendant) called to notify me of an odor that smelled like a 'magic marker' coming from the 3L/3R area. This odor gave the #4 FA a headache. The odor itself was localized to the area already mentioned above and seemed to dissipate when leaving that area. The #4 said that he; and the #2; had smelled it; but was dissipating at that point in time (#2 had no symptoms). I advised the #4 to keep me posted on the conditions in the cabin while we looked at our procedures.Upon reaching our cruise altitude; I called the cabin to speak to the #4 who originally smelled the odor. The #5 FA answered and went to get the #4. When returning to the phone; both the #4 and #5 FA's said they could still smell the odor which was described as a chemical/new-carpet type of smell; also 'lemony' and 'citrusy;' were used to describe it. The odor was not detectable in the forward cabin area. I advised the FA's to keep me apprised of any changes.Later during cruise; the #1 became 'light-headed' and was experiencing a tingling sensation in her legs. She said she was not sure if it was due to smelling the odor (she went back to 3L/R to smell for herself) or not though.The FO (First Officer) and I were in the midst of running our QRH procedures (Odor checklist). We ended up at Step #X and option #X; which directed us to remove the odor source and move passengers if necessary. The checklist was then complete; per the QRH; and directed us not to do an AML entry. This seemed odd; especially since I had two FA's that experienced 'symptoms.' None of the passengers had any complaints of an odor either.Since two FA's were possibly affected by this odor; I asked if they could continue their duties. I brought each of the two FA's into the cockpit to visit with them. One in particular; the #4 who originally smelled the odor; became concerned when he discovered that I was giving consideration to a diversion (into ZZZ1; as we were approaching it). He assured me that he [was] okay with no symptoms; to which I responded that the #1 was not so symptom free though. I thanked the #4 for coming up to the flightdeck and invited the #1 to come up.The #1 was still status quo... still had a light-headed feeling but was unsure of its source. The tingling was still going on in her legs; but again; unsure of its origination. She wasn't sure if it was the odor that she smelled; when going to investigate at 3L/R; or if it was because she was working 'two jobs.' I asked if she wanted to continue; as we could easily drop into ZZZ1 and get some assistance. She said that she would be fine and wanted to continue. I thanked her for coming up as well.After much deliberation I elected to continue to ZZZ2 and write the airplane up as a fumes event. I contacted dispatch; told them of our odor event; but that all passengers were fine and only a couple of FA's were 'affected;' but were fit for duty. No emergency was declared.As we approached ZZZ2; all five of the FA's decided they wanted to be medically evaluated; so I coordinated that with dispatch via ACARS. After landing; CFR (fire trucks) met us at the gate. The passengers deplaned and the FA's were evaluated. I advised Maintenance of what happened; gave them all of the details; and completed the fumes report.Cause - Unidentified odor from mid-cabin.Suggestions - Unsure; as I don't know what the source of the smell was.