need a one ACTIVITY diagram of a medical diganosis expret system

for the patient $($user$)$ who will be able to

$1$ log onto the system or create a new account

$2$ user will choose a symptom that they arew suffering from $($can choose up to $2$ symptoms$)$

$3$ the user will be asked questions by the system

$3$ the system will give the user a diagnosis$/$ results

$4$ the user will be able to exit the system