Cypher query to exclude results based upon relationship - neo4j

Question

I'm trying to out how to exclude nodes from a query. My graph consists of users, skills, skill scoring, questions and endo
user has skills
skill has scorings in relation with questions ((skill)-->(scorings)-->(questions))
endo is a relationship for users and skills scorings ((user)-->(endos)-->(scorings))
I would like to find all question for user, but exclude those questions who user has already endo relationship
I thought I could do :
MATCH (u:`User`),
u<-[rel1:`USERS`]-(s:`Skill`),
s-[rel2:`SKILLS`]->(k:`SkillScoring`),
k-[rel3:`ANSWER`]->(q:`Question`),
u<-[rel4:`ENDO`]-(e:`Endo`)
WHERE NOT((e)-->(u)) AND (u.id='1')
RETURN u, e, k, q
UPDATE:
endo nodes are connected like this.
blue is user node
purple is journaled endorsement node (created at)
green is skill scoring node
In fact the relationship "ENDORSEMENT" has a node (journalised) which connects the skill scoring nodes
UPDATE:
When I execute this query, it returns me the question in connection with the user
MATCH (u:User),
u<-[rel1:USERS]-(s:SoftSkill),
s-[rel2:SOFT_SKILLS]->(k:SkillScoring),
k-[rel3:ANSWER]->(q:Question),
u<-[:ENDO]-()<-[:ENDO]->(k)
WHERE u.id='1'
RETURN q, u
by cons when I execute this query to exclude the question, the query returns me questions but also question that I don't want
MATCH (u:User),
u<-[rel1:USERS]-(s:SoftSkill),
s-[rel2:SOFT_SKILLS]->(k:SkillScoring),
k-[rel3:ANSWER]->(q:Question)
WHERE u.id='1' AND NOT u<-[:ENDO]-()<-[:ENDO]->(k)
RETURN q, u
What's wrong? Any suggestions?
Thanks

Answer 1

Your query first says that u has :ENDO relationship from e, then that e has no relationship to u, but that can't be.
How are endo nodes connected to scorings/questions in those cases you want to exclude? Could you try something like
MATCH (u:User)-[rel1:USERS]->(s:Skill)-[rel2:SKILLS]->(k:SkillScoring)-[rel3:ANSWER]->(q:Question)
WHERE u.id = '1' AND NOT u<-[:ENDO]-()-[:??]->k
and fill in the relationship type at ?? for how the endo node (anonymous node () above) is connected?
If you want you can create an example graph at http://console.neo4j.org, that would help make your intention clear.
Also, it's fine to use backticks around labels and relationships, but you don't need to unless they contain whitespace or some other uncommon characters.