you are right about no indication for word encouragement. But this is True/False/not given , not yes/no/not given. there is a little difference between them.Well - There was no indication as to encouragement, more specifically, if you are referring to the above sentence "I have tried to be more flexible" - This does not mean - encouragement. As per my understanding, the answer should be not given following the order of (T, F, NG)
In true false not given , we have to go with factual info, but in yes no not given we have to find exactly writer's opinion or what is mentioned in simple words ditto info.
moreover, this is my answer. I may or may not be wrong. you can check other members answers as well.. Thanks.