Pay for cancelled sessions

Hello, so my company has been sending me to a camp to work one on one with a client. This camp is an hour away from my house and I am usually paid 15 minutes of travel time each way. This morning I arrived at the camp, checked my assigned note, and realized I was not assigned to the camp client. I reached out to staffing and they told me the client is on vacation this week, and I am to report to the clinic location. They apologized for no one telling me this. What I am wondering is what do I do in this situation? It’s not my fault they didn’t tell me my client wasn’t going to be there. Should they still pay me for 15 minutes of travel each way? I don’t know what to do.