I was charged for a carry on and I’m seeking a refund. **Here is a draft of the contact...

I was charged for a carry on and I’m seeking a refund. **Here is a draft of the contact I sent them. **Today I traveled from PRG to AMS and had to check a bag unnecessarily. Here’s what happened. When I got to the boarding gate I was surprised to discover that I could only bring one bag with me onto the plane. I had been able to take both my duffel and my backpack onto my flight without charge from AMS to PRG on Czech airlines only a week and a half earlier (flight OK*** Reference PHMLNX). I payed for the gate check option on my duffel bag and walked down the boarding alley, only to be prompted to realize that I could put my backpack (which I had chosen to carry on) in my traveling companion’s bag instead, thus allowing me to return to the boarding gate desk and carry on my duffel as my one carry on. Since I saved space overhead and checked a bag unnecessarily, I request a refund. **Please also keep in mind that **** Koruna is roughly ** dollars, money that as a recent university graduate, I find essential to my budgeting for food. Please understand.