Not Getting XML elements?

Question

Hi,

 

I have one API regarding flight search. In that, i am reading the values into xml file and getting elements. In this scenario, one xml element has item names "item" and another element has another item named as "a:item". When i am getting values through "item", it is working fine but through "a:item" values are not getting. How to resolve this problem?

 

 

 

Please help me..It's urgent

 

Thanks in advance