DOT complaint for non US citizen

I'm non-US citizen. I planned a trip to US this summer and booked several (separate) tickets. One of my tickets has recently been canceled with just saying I can rebook that flight. Fortunately I found out that there is the DOT for flights from or to US. But I cannot figure out if this is only possible for US citizens or also for Europeans.
I found this form on their site, but there is no field to enter the country and I can only select a state within the US.
Is it possible for me to file a DOT complaint? If yes, how should I enter my data?

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How do I file a complaint against an international business?

Go to the econsumer.gov website. Select "Report Your Complaint." Read through the What you Need To Know section. Then, select "Report Your Complaint" again. Enter your contact information in the appropriate field, along with the complaint information.

How do I make a complaint about a travel agent in USA?

You can direct most complaints related to travel to: Your state consumer protection office. The Federal Trade Commission (FTC) Your local Better Business Bureau....Complaints About Travel Agents or Travel Agencies

Airlines Reporting Corporation (ARC)

American Society of Travel Advisors (ASTA)

National Tour Association (NTA)

How do I file a complaint with the FAA?

You can email a complaint or question to the following address: faa-air21@faa.gov . Your complaints must include your name, contact information (phone and email), your job, the name of your employer, the type and date of discrimination against you, and a detailed list of the safety allegations you reported.

Does filing a complaint with the FCC do anything?

Complaints may be shared among FCC bureaus and offices for further review and possible investigation. By filing a consumer complaint with the FCC, you contribute to federal enforcement and consumer protection efforts on a national scale and help us identify trends and track the issues that matter most.

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Images: Ketut Subiyanto, Ketut Subiyanto, Uriel Mont, Ketut Subiyanto