why should were hire you????

which is the best one among below two to answer the question "why should we hire you"in the interview? and please tell me your opinion and point out if there any grammatical errors,

1.Sir, I am a fresher I don't have any professional experience yet but I have certain knowledge and confidence about me to prove myself. If given a chance I will definitely prove my worth to the company and I also wanted to start my career with a reputed company like you.

2.I am optimize and hard working person and have desire to achieve goal and I have that kind of key skills which you are looking for. I will stand and deliver my productivity on top in period. My profile is matching for this job which is good to go and I can make stability for long. My dream and my ambition can only come true to work with your organization.