Laura has just met Sara to save money and resources.

Laura is offering his/her parking place to share expenses.

Susana wants to share a taxi (once only).

Ana is looking for a parking place to share expenses.

Cristina is looking for a parking place to share expenses.

Elena has just met Antonio to save money and resources.

Ruby is looking for a lift (once only).

Natanael is either offering a lift or looking for one (daily).