I recently used my UA miles to book a hotel via MileagePlus. After the booking I see in the confirmation e-mail that UA uses Hotels.com for the booking. I typically don't like booking hotels/flights via third party (and in this case, via a third, third party) but this is a relatively low-risk local stay so I wanted to try it out. When I click on any of the reservation links on the email (for example, change/cancel reservation) I am taken directly to the Hotels.com website, where I don't currently have a user account. My question is, if any issues were to arise with this reservation, do I speak with UA or to Hotels.com? And would the hotel recognize my booking as being from UA or Hotels.com?