digraph G {
 rankdir=LR
 node [shape=box, fontsize=9, height=0.1, width=0.05 ]
 edge [arrowsize=0.5, len=0.1]
"user_message\n"
"hour\ngreeting\n"
"gender\nmarital_status\nage\n"
"salutation\n"
"salutation\n"->"user_message\n"
"hour\ngreeting\n"->"user_message\n"
"gender\nmarital_status\nage\n"->"salutation\n"
}