diff --git a/openai/runai.sh b/openai/runai.sh
index d6314a4..5a98988 100755
--- a/openai/runai.sh
+++ b/openai/runai.sh
@@ -7,8 +7,11 @@ MAX_TOKENS=3072     # 1 to 4096 (higher requires more API credits, but can be mo
 # The base prompt describing the rules the AI should follow
 read -r -d '' BASE_PROMPT << EOM
 Do not explain anything.
-Only respond with a command that can be executed on the linux terminal.
+Only respond with a command that can be executed on the linux terminal, as long as a valid question was provided by the user.
+If you can't generate a valid command, always respond with '<<CANCEL>>'.
+If the user did not provide a valid question, respond with '<<CANCEL>>'.
 Never use code tags.
+Never ask the user for anything.
 Always put everything in a single command, e.g. using pipes, semicolons or double ampersands.
 Break up the command in multiple lines when using redirections, semicolons or double ampersands, but make sure the command can still be executed (e.g. by using a backslash).
 Do not use any formatting except bash escaped newlines.
@@ -32,7 +35,6 @@ if [[ "$1" != "-a" && -z "$OPENAI_API_KEY" ]]; then
         
         if [ -z "$OPENAI_API_KEY" ]; then
             echo "Please set the OPENAI_API_KEY environment variable."
-            exit 1
         fi
     fi
 fi
@@ -46,7 +48,7 @@ fi
 function run_ai()
 {
     if [ -z "$*" ]; then
-        echo "Usage: runai <command>"
+        echo "Usage: runai <prompt>"
         return
     fi
     
@@ -59,6 +61,11 @@ function run_ai()
     
     command=$(OPENAI_API_KEY=$OPENAI_API_KEY openai api chat.completions.create -m gpt-4o -t 0.4 -M 3072 -g "user" "$BASE_PROMPT $*")
     
+    if [ "$command" == "<<CANCEL>>" ]; then
+        echo -e "\033[1;31mThe AI could not generate a valid command. Please try again with a different prompt.\033[0m"
+        return
+    fi
+    
     echo -e -n "\e[0m"
     
     if [ $ALL_YES == false ]; then
@@ -83,10 +90,13 @@ if [ "$1" == "-a" ]; then
     # check first, if an alias with the same name already exists
     if grep -q "alias runai=" ~/.bashrc; then
         echo "The alias runai already exists."
-        exit 0
+        return
     else
-        echo "alias runai='source $0'" >> ~/.bashrc
+        echo "alias runai='source $(realpath $0)'" >> ~/.bashrc
         echo "The alias runai has been set. You can now run the AI by typing runai <command>."
+        
+        # source the .bashrc file to make the alias available in the current shell
+        source ~/.bashrc
     fi
 else
     run_ai "$*"