When did the woman absent the physics class last week?

M: Welcome back! I didn’t see you in physics class last Thursday.
W: I was absent myself that day. I went on a trip to New York, I just came back last night.
M: New York! What a city! I’m sure you had lots of fun there.
W: No, not really. I was busy doing business. It’s very hot there, too.
M: Well, did you enjoy the trip? I have never been to New York. I’d like to go there someday.
W: Yeah, it was OK. I went to see the Statue of Liberty and that made the trip interesting. Try to make it during the spring or autumn when the weather is nice.