Hello - I am looking to share a ride from Osaka to Tokyo on the 12th March 2017 please.
Thanks

Hi Pu-san, how are you ?
Do you mean that you have a car and you are looking for people to share a ride with you ?
Or are you looking for a car ?

Dear Anabelle-san,

Thank you for asking me to clarify - I am looking for someone with a car who will be travelling from Osaka to Tokyo on the 12th March please and if I could ride along with her/him.

Hi Pu-san,
I suggest you to create a plan directly via the "create plan" link.
You will be able to specify a lot of details regarding your requirements.