For an Online Travel agency. What other disclaimers should I include?
This will definitely be something on which you'll want to work closely with your attorney.
The terms and conditions is the contract between you and visitors to your website. It needs to be tailored to the needs of your business to establish the terms, including the disclaimers as you noted, that will govern the visitor's use of the site.
A good starting point would be to look at other, preferably reputable online travel agencies and see what terms/conditions and privacy policies they have in place. From there, you can tailor your examples to your needs with the help of your attorney. It is not an endeavor on which I suggest one go alone.
Looking at the terms of competitors is a very good place to begin to understand the legalities involved, but you should never assume those terms will work wholesale for you. One small little provision can make all the difference between LIABLE and NOT LIABLE.
You may also require further legal attention, for example, if you allow for third-party user generated content a proper contact registration will be required to take advantage of the ISP "safe harbor" under the DMCA. This is how YouTube, for example, is not responsible for infringing content.
Another very important aspect is how the terms are implemented on the site. We do a lot of this kind of work and have seen many companies that have very professional terms drafted but they would not be enforceable because they were not properly placed on the site.
Lastly, and as my colleague noted, you have other legal concerns as well: entity formation, copyright issues, trademark, etc.
I suggest you discuss your plans with a lawyer in private and get some insights. The good news is most of us here, including myself, offer a free phone consult. I will link you to some general helpful info below as well
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