9. An issue identification system for automatically identifying one or more issues in one or more tickets of an organization, the issue identification system comprising: a processor; and a memory communicatively coupled to the processor, wherein the memory stores the processor-executable instructions, which, on execution, causes the processor to: receive ticket data of one or more tickets related to a service category from one or more data sources; generate one or more first sub-sequence patterns of n-grams for the one or more tickets from a sequence pattern retrieved from the ticket data; determine frequency of occurrence of each of the one or more first sub-sequence patterns of the n-grams and a Part-of-Speech (POS) weightage of the one or more first sub-sequence patterns of the n-grams; determine a first score for each of the one or more first sub-sequence patterns of the n-grams based on the frequency of occurrence and the POS weightage; identify automatically, one or more issues in the one or more tickets based on the first sub-sequence pattern of the n-grams and the first score; identify the sequence pattern corresponding to the one or more first sub-sequence patterns of the n-grams having the first score less than a predefined value for each of the one or more tickets; generate one or more second sub-sequence patterns of the n-grams by removing one or more words in the sequence pattern in order of occurrence, wherein a distance value is associated with each of the one or more second sub-sequence patterns based on the one or more words removed in the sequence pattern; determine a frequency of occurrence of each of the one or more second sub-sequence patterns of the n-grams and a POS weightage of the one or more second sub-sequence patterns of the n-grams; determine a second score for each of the one or more second sub-sequence patterns of the n-grams based on the frequency of occurrence and the POS weightage of the one or more second sub-sequence patterns of the n-grams; and update automatically, the one or more issues in the one or more tickets by merging the second sub-sequence pattern with the first sub-sequence pattern based on the first score and the second score.
16. The issue identification system as claimed in claim 9 , wherein the processor is further configured to: compare each of the one or more words in at least one of the first or the second sub-sequence patterns of the n-grams with one or more predefined domain keywords; obtain at least one of the one or more first subsequence patterns and the one or more second sub-sequence patterns comprising the one or more predefined domain keywords as a pattern with the highest score based on the comparison; and identify automatically, one or more issues in each of the one or more tickets based on the pattern with the highest score.