transfer list box one item in other combo box

Question

i want to make program simple railway ticket booking,,,,, in making program i took one Combo box and one button so suppose i want going to india to america then i wnt when i put text in text box india so one other list box shows source to destination like i wnt to go india to america so when i click in list box india to america then one window open and fill name,age,source,destination,date of birth and click ok button and again open one window for confirmation messge Confirmation our Passenger nmber is PN96587411.Note: when i put text in text box(in form1) like India so in list box shows source to destinatin like india to america,other india to Lundon and third one is india to Japan.