How do you model a collapsed sub proces

Yannis is planning a trip to Hawaii with a friend. They first decide when to go and how much they can afford to spend. Then, they make their flight and hotel reservations. They wait until the scheduled departure. They travel to the Hawaii and stay in the hotel. They enjoy a number of tourist activities. When their time in Hawaii is done, they fly home.

Use BPMN to model the process using the following independent assumptions:

a When in Hawaii, they enjoy a number of tourist activities. Include a looping task to show this.

b There is a possibility the hotel room and/or flights aren't within their budget. If reservations are too expensive, they will try different dates. If reservations are still too expensive, they will cancel their trip. ***Use a collapsed sub-process and an intermediate error event to model these assumptions****