diff --git a/src/Motorradvermietung.cpp b/src/Motorradvermietung.cpp
index 026bd3e..c255cf1 100644
--- a/src/Motorradvermietung.cpp
+++ b/src/Motorradvermietung.cpp
@@ -19,6 +19,17 @@ public:
     }
 };
 
+class reservation final
+{
+private:
+    tm start_ = {};
+    tm end_ = {};
+    short motorcycle_ = -1; // => nothing reserved
+    string customer_name_;
+    string costumer_first_name_;
+public:
+};
+
 class customer final
 {
 private:
@@ -28,7 +39,6 @@ private:
     unsigned short year_of_birth_ = 1900;
     string phone_no_;
     bool has_driving_license_ = false;
-    short reserved_motorcycle_ = -1; // => nothing reserved
 public:
     customer(string&& name, string&& first_name,address&& address, unsigned short&& year_of_birth,  string&& phone_no, bool&& has_driving_license) : name_(name),
                                                                                                                                          first_name_(first_name),
@@ -41,6 +51,27 @@ public:
     }
 };
 
+/**
+ * \brief ask a question and get a answer.
+ * \tparam T return parameter
+ * \param question the question.
+ * \return the value.
+ */
+template <typename T>
+T ask_question(const string& question)
+{
+    cout << question << endl;
+    cout << "> ";
+    T value;
+    cin >> value;
+    return value;
+}
+
+void create_customer();
+void create_reservation();
+void take_reservation();
+void export_reservations();
+
 int main()
 {
     std::cout << "Hello World!\n";