Time series with specific dots

Hello!

Could somebody please help me. I would like to find a means to get time series plot with some specific dots (i.e. mixing a time series plot with a scatter plot).

I have three csv files. One is a main with current currencies. Two another are with specific dots.

I would like to use one color for specific dots per file (for example yellow color for orders_open.csv file and red color for orders_close.csv file).

Main csv file:

Time (UTC);Ask;Bid;AskVolume;BidVolume
2019.06.03 00:00:00.136;1,11739;1,11736;1;2,44
2019.06.03 00:00:00.608;1,11739;1,11736;3,5;2,62
2019.06.03 00:00:00.711;1,11737;1,11736;1,12;2,25
2019.06.03 00:00:00.814;1,11735;1,11731;1,5;3,56
2019.06.03 00:00:00.929;1,11733;1,11731;1;1,69
2019.06.03 00:00:01.031;1,11731;1,11727;1,25;2,25
2019.06.03 00:00:01.235;1,11732;1,11727;12,49;1,31
2019.06.03 00:00:01.337;1,11732;1,11727;13,22;1,31

orders_open.csv file:

1.11736;2019-06-03T00:00:00.136
1.1178;2019-06-03T00:31:35.457
1.11757;2019-06-03T01:19:21.016
1.11835;2019-06-03T01:41:32.420

orders_close.csv file:

1.1178;2019-06-03T00:31:35.457
1.11757;2019-06-03T01:19:21.016
1.11835;2019-06-03T01:41:32.420
1.11881;2019-06-03T03:20:54.395
1.11858;2019-06-03T03:25:56.587

This is similar plot what I would like to make:

Thank you in advance!