Explanation
Keep in mind that the client wants to encourage people to finalize booking on their site. So you are looking at conversion or bottom of the funnel ads.
In this case, you need to launch conversion and dynamic ads in order to get the most results and optimize campaigns based on specific results on the website.
Be careful in these type of questions, look for phrases like "people who've visited the website" and "complete a new transaction." Traffic ads would be valid for new traffic generation; however, this client wants to focus specifically on conversions. You also want to use dynamic ads since your client has multiple locations so that you can optimize ads by location with their audience.