Can anyone guarantee a number one listing for a search phrase?

No. There are some very talented individuals in this field, but none that can guarantee winning for HIGHLY COMPETITIVE PHRASES such as those in the travel industry. If you meet anyone who claims to have a “special relationship” with the search engines keep one hand on your wallet. If you ever believe them, I have a beautiful bridge in Brooklyn that I would like to sell you. Don’t get taken for a ride. Get references, and examples of past work. As with anything, research before you purchase, and don’t get sucked in by hype.