rejection of an offer

so..lets say \i have to say no to companies like deloitte, PWC and IBM as I decided to go with another major firm..what do you guys think about rejection of their offer without burning bridges for future..just in case.

Thank you for the wonderful opportunity. I am deeply impressed by your company and the extremely talented team you have. At this time, I have decided to join another company. I am grateful for the time you spent in meeting/talking to me. Your company will be one of my top priorities should I decide to switch my career and my employer in future. I am sure at that time, you will also favorably consider my candidacy.

Blah blah blah…

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