The document describes two interactions between a customer, taxi booking system, car, driver, and booking. The first interaction shows a customer calling the taxi booking system to request a ride when there are less than 6 cars available. The system then checks a car, creates a booking, gets the first free driver, and assigns the driver to the car before storing and confirming the booking. The second interaction checks for a car with at least 4 seats if the time is 1:00pm and less than 10 bookings have been made, and then performs similar steps of checking, booking, storing, and confirming.
![SequenceDiagram1interaction
Lifeline1: Customer Lifeline2: TaxiBookingSsytem Lifeline3: Car booking: Booking Lifeline4: Driver
LOOPseq
[Car < 6]
OPTseq
[Car<=6]
1 : call()
2 : checkCar()
3 : create()
4 : getFirstFreeDriver()
5 : assignDriver()
6 : storeBooking()
7 : reply()
Collaboration1::Interaction1::SequenceDiagram1](https://image.slidesharecdn.com/18e5cd57-f0fc-414c-9aaf-cc4ab0ec7d33-160506165707/85/Taxi-Booking-System-UML-Sequence-Diagram-2-320.jpg)
![SequenceDiagram1interaction
Lifeline1: Customer Lifeline2: TaxiBookingSsytem Lifeline3: Car Lifeline4: Booking
LOOPseq
[carSeat >=4]
OPTopt
[time == 13.00 && booking < 10]
1 : call()
2 : checkCar()
3 : checkTime()
4 : booking()
5 : storeBooking()
6 : reply()
Collaboration2::Interaction1::SequenceDiagram1](https://image.slidesharecdn.com/18e5cd57-f0fc-414c-9aaf-cc4ab0ec7d33-160506165707/85/Taxi-Booking-System-UML-Sequence-Diagram-3-320.jpg)