WASHINGTON, Sept 29 (Reuters) - The United States has no plans to "normalise or upgrade" diplomatic relations with the government of Syrian President Bashar al-Assad and also does not encourage others to do so, a State Department spokesperson said on Wednesday. The comments came in response to Reuters questions on whether Washington was encouraging and supporting a rapprochement between Jordan and Syria after Jordan fully reopened its main border crossing with Syria on Wednesday. The move was to boost the countries" struggling economies and reinforce a push by Arab states to reintegrate Syria after shunning it during its civil war.