FlightAware Discussions

Query for flight departure and arrival city

I am new here to use the xml2 api. Following the instructions on the documentation,
I tried the FlightInfo, FlightInfoEx and FlightInfoRequest with flight number as input in python.
However, all reports error of no data available. Could anyone help me with figuring out how to get the flight departure and arrival city by putting into the flightno.?

Many Thanks!