I am fairly new at my job and my manager pulled me into a workshop planning for our clients. I started with the agenda and slowly he let me take the lead with planning, coordination, and execution of the same. Most of the team from our company are high level execs. I had to do tasks such as agenda altering, approvals, coordinate time with everyone, discuss with client etc.
As everyone was new to me, I first introduced myself and then started with the workshop topic. My initial connect with the company execs was very pleasant. As the workshop approached, there were scheduling issues that I tried my best to tackle. The team was updated of the changed agenda at every point and also had all the details of the workshop including date, time, place, participants etc.
My manager recently gave me a feedback that 2 of the execs were not very thrilled with the conversations with me. One of them did not remember the place from our initial conversation and got confused. He said that communication from my side was not very clear and that when I went to chat with him the second time, he was not aware of the place and thus that created confusion in scheduling. The second guy asked about his specific time slot even though the agenda was attached on the same email chain and when I replied by saying that "it is already attached and here is your time slot. I also request everyone to join 5-7 mins prior for ease", he did not like my tone/way of communicating and said that it was not clear.
What is it that I can do to be more likeable? Most of the people I am dealing with at work are 40-50+ year old men who are tenured in the industry. I am a female in my 20s for reference. It did not seem to me that my manager tried to defend me as he did not even do his research to see that I had replied and read the other conversations going on.