The following text is for questions 14 to 16.

Dear Karunia Rahmat,

    You are kindly invited to attend the 4th Youth Leadership Conference, from 12 to 15 June 2017 at Mangga Room, Oceanic hotel.

    It will be organized by Leadership Promoters, a non-profit organization for empowering the younger generation. This organization provides training and workshops for Indonesian future leaders. Each year, we manage a conference, attended by the Youth Ministry, leadership and motivational experts, to discuss the effective methods and approaches in training young leaders.

    Mr Thomas Berdikari will be our keynote speaker this year. He is a leadership expert from Future Generation Consulting. He is going to present a topic Young Leaders Will Be the Future Asset of Our Nation. As you are president of a students' association, we believe the conference will be beneficial for you.

    Kindly let us have your response by 31 December. We look forward to hearing you can attend. For any further information, don't hesitate to contact us by phone at 111-111-3333

Yours sincerely,

Tiara Bersami
Chairman

".... don't hesitate to contact us by phone at ...." (Paragraph 4)

What is the synonym of the underlined word ?