Can this be done only with Session Beans ?

Hi all,
suppose I have an airline web selling ticket application.
This is the web flow:
-The user chooses destinations & date
-The user chooses seats
-The user confirms to buy
If it's NOT required to persist itineraries until the user confirms to buy,
can this be done ONLY with Session Beans ?
I think that there aren't cuncurrency problems because even if two persons will book the same flight, they'll get different sequence Id (if the sequence is generated by the DataBase).
I think the worst scenario is if two person book the last seat at the same time, one will get an error.......
What do you say to it ?
Thanks
Francesco

If it's NOT required to persist itineraries until the
user confirms to buy,
can this be done ONLY with Session Beans ?Yes. Even if persistence is required, you can use only session beans with some persistence mechanism.

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