In my state, the lawyers for both sides are presented with the available dates on a printed form and they are supposed to indicate the dates that they have available. The clerk of court then compares the two lists and schedules the earliest mutually available date.
Each lawyer is required to give a reason for each date they reject. Acceptable reasons are stuff like "in court" or "on vacation." An unacceptable reason would be "don't wanna."
If one side suspects the other is being dilatory and can prove it to the judge, the judge will then award a percentage of legal fees to the side found to be dilatory. This percentage can go all the way up to 100%.
That's why my ex had to pay my entire legal bill; his (young and very inexperienced) lawyer could not control her client and after the judge looked at the entire file, he found that my ex and/or his lawyer had been dilatory.
Again, states differ in how procedures, so this may not be true of Oregon.
I think, however, it's pretty universal for lawyers to want to avoid irritating the judge unnecessarily.