Niles learns that Frasier had a date the previous evening, and expresses his condolences, assuming it went badly.
A brisk game of squash would be the best thing for you. I can't think of a better way to lift your spirits.
[Enter Cassandra]
Frasier now has both Faye and Cassandra in the apartment, each unaware of the other's presence. Niles has only seen Cassandra.
[Faye enters.]
Got anymore hiding in the Grotto, Hef?
These quotes come from Wikiquote's Frasier pages and are available under the Creative Commons Attribution-ShareAlike License.