How to write name in skymark airlines booking

I want to book a ticket, in my passport i have 3 words name, but when booking. I only can write 1 first name and 1 last name. And space aren't allowed, so is it okay if i only input my first and last name, (without my middle name).

Accurate names are not important on Skymark flights. As a matter of fact, your identiy never even gets checked. All you need to pass security and board a plane is a valid ticket.

I would say it's better to inquire that to Skymark, but is your flight is a domestic one? If so, they won't care so much whether you write your middle name perfectly or not in the reservation. So this method below would be okay, in my opinion.

Your Name (example): John David Smith

Surname: Smith
Name: John

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Or, it may be okay to write your name like below, if you don't want omit your middle name:

Surname: Smith
Name: JohnDavid