User:

$-$Initiates travel planning.

$-$Makes choices for transportation, accommodation, and activities.

$-$Completes secure payments.

$-$Provides preferences for itinerary customization.

Service Providers $($Transportation & Accommodation$)$:

$-$Provides information and integrates with HolPlan for options.

Payment Gateway:

$-$Handles secure transactions with various payment options.

Customer Support:

$-$Assists users and addresses queries.

these are our actors. please use these actors, create a design class diagram