Hi, former airline employee here... as long as the name is correct, it's not an issue if it's run together in the first name 'space' and not spaced out first, middle, last. as long as the name(s) on the documents match.
example: if the passport is issued in the name of Robin Rae Williams, and the resv reads Robinrae williams, it will be ok. it's if the name(s) don't match that will raise an issue. Example: Legal name is Roberta Rae Williams, but nickname is Robin, and booking was made under Robin instead of Roberta, that's not going to work.
hope this helps