New Delhi, Sept. 25 -- India and the United States are optimistic to resolve both trade and non-trade issues soon as senior officials at different levels from both sides are constructively engaged to enhance bilateral ties and facilitate market access, an official said. Referring to the visits of Union commerce minister Piyush Goyal and external affairs minister S Jaishankar to the US, the official cited above said, "talks are happening at different levels" and progressing well in a positive direction. According to the official, who requested anonymity, the two economies are natural partners because they complement each other rather than competing in trade and commerce. Goyal is leading a delegation to the US to accelerate talks for a bilateral trade agreement (BTA) as agreed by the two leaders -- Prime Minister Narendra Modi and President Donald Trump on February 13. The minister is expected to return to New Delhi later this week, he said. After a brief hiatus in trade negotiations post the fifth round, talks have gained momentum, he said. According to him, US chief negotiator Brendan Lynch's recent India visit last week and the Indian team's current US visit are significant developments....