Just a piece of advice: NEVER consult dealerships for such maintenance and replacements unless it's required (like Warranty etc.), otherwise, the dealerships will rip you off and charge you way more than what you can get outside at a much lesser price.
I suggest you buy the spark plugs from some reliable Honda parts shop (you can find easily around Azhar Shaheed Market in Saddar, Rawalpindi) and if you have done it before, you can D.I.Y., or you can get it installed from any reliable mechanic and you can save a lot of money.
The rest is your choice.
Hope it helps.