Bows are so integral to Japanese behavior that you’ll see the Japanese even unintentionally bowing to the person on the other end of a phone call.
But executing a correct Japanese bow can be a very complex matter. Social status, age, experience, and job position all come into play into how deep and how long to bow.
Because the Japanese won't expect you to know all the intricacies involved, you won't be expected to bow. A small bend at the waste though is a good idea, and will show just enough deference to their culture to be appreciated.