Being flexible with the schedule you are willing to work is always a plus, especially for a travel nurse. Being upfront with the interviewer about what schedule suits your preference could help prevent conflict later on. It is easier to plan a schedule you can agree on than it is to fix problems that arise due to fear of being rejected. Be honest and direct.
"If I had a choice, I would prefer the late shift, as I am a bit of a night owl. However, I am excited about the opportunity to work as a travel nurse and am willing to work when and where I'm needed."
"Yes, I am open to work odd shifts and holidays. Travel nursing is something I really want to be active in and am open to work any shift."
"When I chose travel nursing, I knew that would mean working some shifts that are a little varied. I love what I do and it doesn't matter what kind of schedule I have to work."