question: How does this help the system ?
answer: the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls
turker_answer: This helps the system because the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls .
rule-based: This helps the system by the system knows every user call and can cancel the first call if the passenger decides to travel to another destination to prevent empty calls .