Answer:
The revised version of the sentence would be as follows: I wanted to go to Thailand for our vacation, but my brother wanted to go to Alaska.
Step-by-step explanation:
A coordinating conjunction is a conjunction that joins two similarly constructed or syntactically equal words, phrases, or clauses. In this case, the coordinating conjunction but has been used to linked these two sentences. "But" introduces a phrase or clauses contrasting with what has already been mentioned. The speaker wanted to go to Thailand. On the contrary, his/her brother wanted to go to Alaska.