US Assistant Secretary of State for South and Central Asian Affairs, Richard A. Boucher Monday said there was no rift in relations between Pak and US, adding contacts and cooperation would continue between two countries. He said US values its ties with Pakistan as Islamabad has been a praise worthy ally in war against terrorism. Answering a question, he said there was no apparent reason to think about any crack between Washington and Islamabad and added two sides were cooperating each other in various sectors. He further said US leadership would hold positive talks with Pakistani delegation set to visit US to attend the General Assembly of United Nations.  When asked about US drones attacks in tribal areas of Paksitan, US Assistant Secretary didn't give any clear answer.